5-series aluminum alloy plate for upper cover of automobile power battery pack and preparation method of 5-series aluminum alloy plate

Abstract

The invention relates to a 5-series aluminum alloy plate for an upper cover of an automobile power battery pack and a preparation method of the 5-series aluminum alloy plate, and belongs to the technical field of aluminum alloy production. The aluminum alloy is prepared from the following element components in percentage by weight: 0 to 0.10 percent of Si, 0 to 0.20 percent of Fe, 0.15 to 0.25 percent of Cu, 0.35 to 0.45 percent of Mn, 4.50 to 5.00 percent of Mg, 0.05 to 0.15 percent of V, less than or equal to 0.05 percent of single impurities, less than or equal to 0.10 percent of total impurities and the balance of Al, wherein the requirements of alkali metal are as follows: Na is less than or equal to 10ppm, Ca is less than or equal to 8ppm, and Li is less than or equal to 15ppm, and the prominent problem of surface quality defects of a TYPE B-type Luders strip easily occurring in the application of the existing 5 aluminum alloy to the upper cover of the automobile power battery pack is solved through the process steps of casting, saw milling, homogenization, hot rolling, cold rolling and complete recrystallization annealing.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy production, and in particular relates to a 5-series aluminum alloy plate for an upper cover of an automobile power battery pack and a preparation method thereof. Background technique [0002] Modern automobile technology is gradually developing in the direction of energy saving, environmental protection and safety. The energy consumption of a vehicle is proportional to its total mass, and lightweight design is an important issue in the development of automotive technology. For pure electric passenger vehicles, the lightweight of the whole vehicle can significantly improve the cruising range of pure electric passenger vehicles while reducing energy consumption and environmental pollution. [0003] In 5000 series aluminum alloys, the interaction between dislocations and solid solution Mg atoms is the main reason for the unstable plastic deformation during uniaxial stretching. In alloys with...

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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a 5-series aluminum alloy plate for the upper cover of the automotive power battery pack and its preparation method, which solves the TYPE B type that is easy to appear in the application of the current 5 aluminum alloy in the upper cover of the automotive power battery pack. Prominent Problems of Surface Quality Defects in Lüders Strips

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