Abstract
In this paper, we investigate pulsed eddy current (PEC) testing based on a rectangular sensor for the purpose of defect shape mapping in electric vehicle lightweight alloy material. Different dimensional defects were machined on the 3003 aluminum alloy and detected using the A-scan technique and C-scan imaging in two scanning directions. The experiment results indicated that defect plane shape could be preliminarily obtained and length and width could be estimated based upon C-scan contour images. Consequently, the comparison of results between the two directions showed that the C-scan identification in the direction of magnetic flux was better than in the direction of the exciting current. Finally, subsurface defects and irregular defects were detected to verify the performance of shape mapping as a recommended approach. The conclusion drawn indicates that the proposed method, based on PEC rectangular sensors, is an effective approach in reconstructing a defect’s shape.
Highlights
In order to make power lithium-ion battery systems for electric vehicles with higher energy densities, a significant amount of aluminum alloy and composite materials are used in the battery shell.As an important material in electric vehicle power batteries, shells, and cover plates, 3003 aluminum alloy plays an important role in new energy vehicles
This paper outlines Pulsed eddy current (PEC) detection based on rectangular coils in order to prevent accidents caused by shell defects in power-battery aluminum alloys
Defect shape mapping is realized by picking up the coil in both the direction of magnetic induction and the direction of the excitation current
Summary
In order to make power lithium-ion battery systems for electric vehicles with higher energy densities, a significant amount of aluminum alloy and composite materials are used in the battery shell.As an important material in electric vehicle power batteries, shells, and cover plates, 3003 aluminum alloy plays an important role in new energy vehicles. PEC testing has more advantages than ordinary eddy current (EC) testing, such as: a deeper detection depth [10], easier generation and control [11,12], and richer information in frequency domains. It is widely used for the measurement of the conductivity and thickness of metal [13], and in defect characterization [14,15,16,17,18]. This nondestructive testing method can detect the surface
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