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Aluminium alloy plate with excellent laser welding performance and preparation method thereof

A technology of laser welding and aluminum alloy plate, which is applied in the field of aluminum alloy processing, can solve the problems of poor weld pool uniformity, affecting the safety performance of the shell sealing battery, and high quality defect rate, so as to prevent abnormal weld pool and excellent laser Welding performance, high strength effect

Active Publication Date: 2013-10-23
CHINA ALUMINUM INT ENG CORP
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Problems solved by technology

However, there are certain problems with the above alloys: (1) 1050 alloy is relatively soft, and it is easy to cause deformation of the shell mouth and plane after being impacted or squeezed by external forces during packaging and transportation; (2) Air holes and leaks are prone to occur during laser welding (3) When the penetration depth of the weld pool exceeds 0.35mm, the uniformity of the weld pool will be significantly deteriorated, and the spatter will be serious, which will affect the sealing of the shell and the safety performance of the battery
[0008] The aluminum alloy plate mentioned in the above-mentioned patent is used as a material for the case cover of a power lithium-ion battery (especially a large-capacity lithium-ion battery) and does not have the characteristics that must be met, especially whether the penetration depth of the weld pool can reach more than 0.4mm maintain good uniformity

Method used

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  • Aluminium alloy plate with excellent laser welding performance and preparation method thereof
  • Aluminium alloy plate with excellent laser welding performance and preparation method thereof

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Embodiment

[0034]The alloy given in Table 1 was melted and cast, and the alloy ingot was heated from room temperature to 600°C at a heating rate of 50°C / h and kept at a temperature of 2h, then cooled at a rate of 50°C / h to 500°C and kept at a temperature of 2h, and then hot-rolled; Then cold-roll the hot-rolled sheet to a thickness of 1.0mm, raise the temperature of the cold-rolled sheet to 380°C at a rate of 30°C / h and keep it warm for 1 hour, then air-cool to finally obtain the required sheet.

[0035] Table 1

[0036]

[0037] Table 2 shows the evaluation results of tensile strength, elongation and pulse laser welding performance of each alloy sheet in Table 1.

[0038] Table 2

[0039]

[0040] Remarks: 1) The pulse laser welding performance is evaluated when the weld pool penetration is within 0.4~0.6mm;

[0041] 2) Observing the surface of the weld pool through an optical microscope, the weld pool without spatter is "O", and the spatter is "×";

[0042] 3) Observing the...

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Abstract

The invention relates to an aluminium alloy plate with excellent laser welding performance and a preparation method thereof. The aluminium alloy plate comprises the following components: 1.2-1.8 wt% of Fe, 0.05-0.5 wt% of Mn, Ti being less than or equal to 0.012 wt%, B being less than or equal to 10 ppm and the balance Al and unavoidable impurities; or the aluminium alloy plate also comprises one or more components selected from less than 0.2 wt% of Si, less than 0.2 wt% of Cu and less than 0.15 wt% of Cr. Nd:YAG pulse laser absorptivity by the aluminium alloy plate reaches more than 18.8%. The alloy sheet has excellent laser welding performance. Even if fusion depth by pulse laser welding exceeds 0.4mm, there is no abnormal welding pool, splashing or crack. Meanwhile, the aluminium alloy plate has good mechanical performance and formability and can meet manufacturing requirements of lithium ion battery shells of different capacities and specifications.

Description

technical field [0001] The invention relates to an aluminum alloy for a power lithium-ion battery casing and a plate thereof, in particular to an aluminum alloy plate with excellent laser welding performance and a preparation method thereof, belonging to the technical field of aluminum alloy processing. Background technique [0002] At present, aluminum alloys specially used for lithium-ion battery casings of electric vehicles are still in the initial stage of research and development. In consideration of the reliability of alloys, 1050 and 3003 alloys are widely used in domestic power lithium-ion battery casings. However, there are certain problems with the above alloys: (1) 1050 alloy is relatively soft, and it is easy to cause deformation of the shell mouth and plane after being impacted or squeezed by external forces during packaging and transportation; (2) Air holes and leaks are prone to occur during laser welding (3) When the penetration depth of the weld pool exceed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04
Inventor 潘琰峰赵丕植江涛石相军冯莹娟吴新星
Owner CHINA ALUMINUM INT ENG CORP
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