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

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...

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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

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