Method for integrally improving corrosion resistance of 7-series aluminum alloy battery pack shell

An overall lifting, aluminum alloy technology, applied to the surface coating device, furnace type, coating and other directions, can solve the problems of unclean electrophoresis drainage, many processes, easy corrosion resistance, etc., to solve the problem of poor drainage. net effect

Inactive Publication Date: 2021-06-22
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a method for overall improving the anti-corrosion performance of the 7-series aluminum alloy battery pack case, and solve the stress corrosion problem existing in the 7-series aluminum alloy base material and weld seam used in the battery pack case, Solve the situation of electrophoresis and other surface drainage that is not clean, many processes, high cost, serious pollution, and easy failure of anti-corrosion

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  • Method for integrally improving corrosion resistance of 7-series aluminum alloy battery pack shell

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 Shown is a schematic diagram of the main flow of an embodiment of a method provided by the present invention. In this embodiment, the method includes the steps of:

[0022] Step S1, after extruding the profile, performing a double-stage aging treatment on the extruded profile in an aging furnace;

[0023] In a specific embodiment, the two-stage aging treatment includes the first-stage aging treatment: setting the temperature range of the aging furnace within 80 to 150 degrees, and performing heat treatment on the extruded profile in the aging furnace for a predetermined time, The predetermined time range is 4 to 8 hours; the two-stage aging treatment includes a second-stage aging treatment: after the extruded profile has undergone the fir...

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Abstract

The invention provides a method for integrally improving the corrosion resistance of a 7-series aluminum alloy battery pack shell. The method comprises the following steps of S1, extruding a profile, and conducting two-stage aging treatment on the extruded profile in an aging oven; S2, after the profile is welded to form the shell, conducting secondary aging treatment on the whole shell in the aging oven; and S3, spraying the treated shell with a PVC coating, and conducting three-stage aging treatment after drying. By means of the method, the stress corrosion problem existing in the 7-series aluminum alloy substrate and the welding seam used by the battery pack shell is solved, and the conditions that electrophoresis and the like are not thorough in surface liquid drainage, many in working procedure, high in cost, serious in pollution and prone to failure of corrosion prevention are solved.

Description

technical field [0001] The invention relates to the field of industrial processing, in particular to a method for overall improving the anticorrosion performance of a 7-series aluminum alloy battery case. Background technique [0002] At present, 6061 aluminum alloy is mostly used for power battery shells. The strength of 6061 aluminum alloy is about 280MPa, while the tensile strength of 7-series aluminum alloy can reach more than 400MPa. Using 7-series aluminum alloy can realize lightweight design on the battery pack shell, but Due to the risk of stress corrosion of 7-series aluminum alloys, it is easy to cause failure under the joint action of stress and corrosion, especially the production of the lower shell uses a variety of welding methods, such as friction stir plate (FSW welding), cold metal Excessive welding (CMT welding), non-melting electrode gas shielded arc welding (TIG welding), the weld area generates a lot of heat due to welding, and the corrosion resistance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D9/50C22F1/04B05D5/00B05D7/14B05D7/24
CPCC21D9/0068C21D9/50C22F1/04B05D5/00B05D7/14B05D7/24B05D2202/25
Inventor 欧阳志军于成龙吴文娟侯晓婷李昌明曾维权陈伟胡玲玲
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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