Accurate detecting method for cavity leakage of lithium-ion battery and device thereof

Abstract

This invention relates to a kind of precision test method of lithium ionizaation cell cavity leak and its device. The steps as follows: (1) vacuumize phase, time control at T1:3 to 5 second within, flip the inner vacuum of cell cavity to a certainty value P1;if vacuum degree within T1 can not achieve P1 value, it illustrate battery cavity has obvious leak, judge for badness; (2) keep balance phase: time control at T2:2 to 3 second within, keep cell cavity sealing, keep its vacuum level, stabilize gas path, suppress interference;(3) detection phase: clean display of initiating electron vacuum gauge, time control at T3:1 to 4 second within, detect cell cavity inner vacuum degree's variance delta P, if delta P greater than set value, then cell cavity has micro leak, judge for badness;(4) complete phase, time control at T4:0.2 to 0.5 second, restore cell cavity to normality. This device can proceed automatic discrimination to badness cell, advance detect precision and / or efficiency.

Description

technical field [0001] The invention relates to a lithium ion battery leakage detection method and a device thereof, in particular to a precise detection method and a device thereof for lithium ion battery cavity leakage. Background technique [0002] Japan's Sony Corporation and Sanyo Corporation began research on the practical application of lithium-ion secondary batteries in 1985 and 1988, respectively. All countries in the world have studied the application performance of lithium-ion secondary batteries in the field of communications, portable electronic products, electric vehicles, and aerospace. Great attention has been paid, and the performance of lithium-ion secondary batteries, especially the manufacturing process, has been continuously explored and improved. After the rapid development of lithium-ion batteries in recent years, its main development tends to be stable; such as the sealing of the square battery case and the cover, the early purely mechanical riveting ...

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Problems solved by technology

[0003] At present, the detection methods used in the production of enterprises are relatively primitive, basically using the liquid "bubbling" method, and some using some simple tooling and ordinary pressure gauges for detection; but none of them can accurately detect whether there is leakage in the battery, especially for small leakage. It is impossible to detect the battery with a pressure difference of 100Pa

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