Aluminium alloy strip used for housing of mobile phone lithium battery and method for preparing same

Abstract

An aluminium alloy strip used for a housing of a mobile phone lithium battery provided by the invention has tensile strength which can reach 170 to 190 MPa, an elongation rate after fracture being 3.0 to 5.0 % and an earing ration being 3 to 4 %, and can meet the requirements of the novel mobile phone battery housing for asymmetric-box-type large-proportion thin stretching and punching forming. A method for preparing the aluminium alloy strip used for the housing of the mobile phone lithium battery enables materials to be uniform in organization and no rough and nonuniform secondphase particles to exist through strictly controlling the mass percent of each alloy element, and treating by homogenizing annealing to eliminate intragranular segregation of Mn element before hot rolling. Due to the addition of a certain amount of Mg element, grain sizes of a finished product can be controlled to be below level one while improving the strength of the materials, so that the comprehensive properties such as material strength, toughness, deep-drawing and the like can be greatly improved.

Description

technical field [0001] The invention relates to an aluminum alloy strip material for a mobile phone lithium battery casing and a preparation method thereof. Background technique [0002] Mobile phones have become one of the necessary communication tools for modern people. With the continuous development of the mobile phone market, more and more smart phones are now used with powerful functions, and are developing in the direction of wide screen and thin wall; The lithium battery that provides energy power for mobile phones will consume more and more power, and the service time will be longer and longer, and the shape of the battery will become flatter and wider; for this reason, it is necessary to further reduce the wall thickness and thickness of the lithium battery shell. Increase the depth of the shell to increase the battery capacity of the battery shell, increase the battery life, ensure the smooth punching of flat and wide battery shells and improve the explosion-proof...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the existing 3003-H14 aluminum alloy strips used in mobile phone lithium battery casings have low tensile strength, low elongation after fracture, high earing rate, coarse grain size, and material problems. After being thinned and stretched, it is difficult to meet the requirements of modern mobile phones, especially smart phones, for lithium batteries and casings, and a method for manufacturing aluminum alloy strips for mobile phone lithium battery casings is provided.