Leakage detection device and leakage detection method

Abstract

This invention discloses a leakage detecting device and a method to detect leakage. Pulsed laser light L is condensed with a reductive condensing optical system 51, fairing it to a circular geometry corespondent to the geometry of a negative electrode face 23 the leakage of lithium electrolysis solution of a lithium coin cell 2 is be worried. The pulsed laser light L condensed to a circular geometry is irradiated to the central portion of negative electrode face 23 of the lithium coin cell 2. Leakage of lithium electrolysis solution from a lithium coin cell 2 is detectable with a high degree of accuracy, even if fluorescence F generated from emission by irradiation of pulsed laser light L might as well be determined from quantification with a discriminating device 67 after spectral analysis with a fluorescence spectrometer 65.

Description

technical field [0001] The present invention relates to a leak detection device for detecting leakage of content from an inspection object based on fluorescence generated by laser irradiation, and a leak detection method using the leak detection device. Background technique [0002] Generally, a coin-type lithium (Li) ion battery is known as a product in which contents are enclosed. When manufacturing a lithium ion battery, after the lithium electrolyte is accommodated in the battery body, the battery body is riveted with a gasket to seal the lithium electrolyte in the battery body. Then check the lithium-ion battery, whether the lithium electrolyte is leaking in the gasket part. [0003] Furthermore, as the leakage detection of the lithium electrolyte solution, the leakage of the lithium electrolyte solution is visually judged by many persons using a microscope or the like. However, when judging the leakage of the lithium electrolyte by visual inspection, various products...

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Problems solved by technology

[0005] However, in the above-mentioned spectroscopic analysis unit, since the object to be inspected is irradiated with a pulsed laser beam focused into a point shape, the fluorescence generated by the object to be inspected is subjected to spectral spectroscopic analysis, and various elements contained in the object to be inspected are quantified. The problem that it is difficult to detect the leakage of the contents of the object with high precision and high efficiency

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