Photoacoustic lithium battery detection system based on optical fiber

Abstract

The invention discloses a photoacoustic lithium battery detection system based on optical fibers, and belongs to the field of battery structure health monitoring. Comprising an excitation module, a signal demodulation module, a detection module and an optical fiber coupler. Excitation light enters the surface of the battery through the beam shaping unit, the optical fiber coupler and the optical fiber ultrasonic probe to generate an ultrasonic signal. The detection light is reflected to form a detection signal after passing through the optical fiber circulator, the optical fiber coupler and the optical fiber ultrasonic probe. The lithium battery is moved through the displacement control platform, ultrasonic signals of different parts of the lithium battery can be obtained, accordingly, corresponding detection signals are generated, structural information of the different parts of the lithium battery is obtained through analysis, and imaging of the battery structure is achieved. According to the method, an optical and ultrasonic combined method is adopted, internal structure data of the lithium battery can be measured in practical application, and analysis and prediction of internal damage of the battery are achieved. The device has the advantages of being small in size and high in resolution ratio, can conduct nondestructive testing on the lithium battery and has the high-precision imaging capacity.

Description

technical field [0001] The invention belongs to the field of battery structure health monitoring, and more specifically relates to a photoacoustic lithium battery detection system based on optical fiber. Background technique [0002] Lithium battery, as an energy storage device with high energy density, has a good performance in both daily life and military applications. However, the use of lithium batteries is accompanied by the problems of gas production, lithium precipitation, solid-liquid interface changes and electrolyte infiltration that may occur in the internal electrochemical process, which brings danger to the use of lithium batteries. Therefore, the health detection and early warning of lithium batteries are carried out becomes particularly important. Conventional battery detection methods, such as infrared, electron beam and other imaging methods, are not satisfactory in battery detection due to lack of penetration, speed and accuracy. Existing in-situ analysis ...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing ultrasonic battery testing equipment is electronic, designed with piezoelectric ceramics, susceptible to electromagnetic interference, and large in size, which brings difficulties for reuse. However, the photoacoustic testing system based on optical fiber, due to its small size , high flexibility, anti-electromagnetic interference and other characteristics have received more attention

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