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High-strength aluminum alloy used for lithium ion battery shell and having excellent laser welding performance

A lithium-ion battery, laser welding technology, applied in the direction of battery pack parts, circuits, electrical components, etc., can solve problems such as difficulty in meeting the performance requirements of new products, insufficient expansion resistance of battery shells, and easy deformation, and achieve excellent laser performance. Welding performance, beneficial to industrial production and application, low cost effect

Active Publication Date: 2014-08-13
CHINA ALUMINUM INT ENG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strength of the traditional 3003 alloy is low, and it is easy to deform after thinning, and the expansion resistance of the battery case is insufficient. Even when the internal pressure is small, it is easy to produce a large amount of expansion. This alloy is difficult to meet the performance requirements of new products.

Method used

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  • High-strength aluminum alloy used for lithium ion battery shell and having excellent laser welding performance
  • High-strength aluminum alloy used for lithium ion battery shell and having excellent laser welding performance
  • High-strength aluminum alloy used for lithium ion battery shell and having excellent laser welding performance

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Embodiment

[0057] According to the composition of each alloy in Table 1, the semi-continuous casting method was used to prepare the ingot, the thickness of the ingot was 500mm, and the width was 1100mm.

[0058] After the face milling of the ingot, the homogenization treatment was carried out, the heating temperature was 600° C., and the holding time was 8 hours.

[0059] After the homogenization is completed, hot rolling is started, and the final rolling temperature is controlled at 280° C. to obtain a hot-rolled sheet with a thickness of 6 mm.

[0060] After the hot-rolled sheet is cooled to room temperature, it is cold-rolled. When preparing the O-state sheet, it is directly cold-rolled to the target thickness (1mm-2mm), and then the final annealing is performed to obtain the O-state sheet; when preparing the H1X-state sheet, it is cold-rolled first to obtain different thicknesses. The intermediate cold-rolled sheet, and then carry out intermediate annealing in two ways: ①salt bath in...

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Abstract

The invention relates to a high-strength aluminum alloy used for a lithium ion battery shell and having excellent laser welding performance. The high-strength aluminum alloy comprises the components: 1.0-1.5 wt% of Mn, 0.2-1.0 wt% of Mg, 0.3-0.399 wt% of Cu, 0.251-0.4 wt% of Si, 0.2-0.6 wt% of Fe, less than 0.05 wt% of Ti, less than 0.005 wt% of B, and the balance Al and inevitable impurity elements, wherein Mn (wt%)+Mg (wt%)+Cu (wt%)>=1.8 wt%, and Mg (wt%)+Cu (wt%)+Si (wt%)<=1.4 wt%. Aluminum alloy sheet materials having the alloy components have excellent laser welding performance and good thinning-deep drawing formability, moreover, the tensile strength of an O-state sheet material is not less than 170 MPa, the tensile strength of an H1X-state sheet material is not less than 230 MPa, and the aluminum alloy sheet materials are suitable for manufacture of the lithium ion battery shell.

Description

technical field [0001] The invention relates to a high-strength aluminum alloy for lithium-ion battery shells with excellent laser welding performance, which is suitable for manufacturing lithium-ion battery shells for 3C (Communication, Computer, Consumer Electronics) products such as mobile phones, notebook computers, digital cameras, and game machines. Power lithium-ion battery case for new energy vehicles. Background technique [0002] Lithium-ion batteries have the advantages of small size, light weight, high specific energy, stable discharge voltage, long cycle life, good safety performance, wide working range, no pollution, no memory effect, and low self-discharge rate. They are used in mobile phones, notebook computers, It is widely used in 3C products such as digital cameras and game consoles. It is currently the best irreplaceable source of power supply, and it is also the first choice for power batteries for new energy vehicles. [0003] According to the producti...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C21/08H01M2/02H01M50/119
CPCY02E60/10
Inventor 迟之东赵丕植刘婧
Owner CHINA ALUMINUM INT ENG CORP
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