Aluminium alloy plate for battery case and its manufacturing method

Abstract

Provided is an aluminum alloy plate for a battery case which is excellent in moldability and laser weldability and shows little swelling deformation, even when temperature and pressure inside the case are increased after repetitive charging and discharging. The aluminum alloy plate is a plate material of an aluminum alloy comprising >1.0% and <1.5% Mn, >0.3% and <0.8% Mg, >0.3% and <0.6% Cu, 0.05-0.25% Si, 0.2-0.5% Fe and the balance being Al and impurities, wherein the relation: 3Cu(%) C22C 21 / 00 1 9 1 2003 / 10 / 17 1497051 2004 / 5 / 19 100500901 2009 / 6 / 17 2009 / 6 / 17 2009 / 6 / 17 Sumitomo Light Metal Industries, Co., Ltd. Japan Tanaka Hiroki Nagai Yasunori Ito Tomoyasu pan peikun jing zhiqiang 72003 Japan 2002 / 10 / 18 2002-303856 Japan 2003 / 7 / 15 2003-274451

Description

technical field [0001] The present invention relates to an aluminum alloy plate for a battery case, more specifically, an aluminum alloy plate for a battery case used in a lithium ion battery such as a mobile phone or a notebook computer, and a method for producing the same. Background technique [0002] In recent years, the popularity of mobile phones and notebook PCs has been remarkable, and there has been an increasing demand for lightweight assembly parts in order to facilitate portability. Especially in terms of weight, the weight of the battery is very large, so the contents of the battery and the battery case are being reduced in weight. For the contents of the battery, a high-capacity and light-weight lithium-ion battery has been developed, and For the battery case, it is also developing from steel plate or stainless steel plate to aluminum alloy plate. [0003] When the battery case is made of an aluminum alloy plate, since the battery case is square, there is a pr...

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Problems solved by technology

[0005] In this case, the battery case formed of the A3003 alloy plate has such a difficulty that merely making its thickness thinner cannot withstand the internal pressure caused by the expansion of the content in the battery, causing the battery case to swell, which There are not many situations where fatal conditions such as failure or damage may occur

As a countermeasure, increasing the thickness of the battery case material increases the weight of the case, so the result is not good

[0006] As an aluminum alloy plate that is difficult to creep and deform, shrinks in section, and is thinned and drawn into a square shape, it is proposed to use an aluminum alloy case material for a square battery (JP-A-2000-336448, Japan Publicly Disclosed No.2000-336448), which is composed of 0.3-1.5% of Mn, 0.1-0.5% of Si, 0.3-1.0% of Fe, less than 0.5% of Cu, 0.1-1.2% of Mg, including residual Al and unavoidable There are also suggestions to use aluminum alloy materials for battery frames (JP-A-2001-3131, namely Japan Publicly Disclosed No.2001-3131), which contain Si 0.1-0.5%, Mg 0.1- 1.5%, Cu 0.02~1.5%, also contains Mn 1.5% or less, Fe 1.0% or less, and includes the residual part A1 and unavoidable impurities, but these materials only consider two aspects of creep characteristics and laser weldability , but does not have sufficient characteristics as a battery case must have

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