Method and device for detecting air tightness of battery cell

Abstract

The invention discloses a method for detecting the air tightness of a battery cell. The method comprises the following steps: the airtightness of the device is detected and the CCD measurement systemis calibrated; the battery cell is put into a flow pulling basket in a vertical state; the flow pulling basket is placed on the detection table, the flow pulling basket with the battery cell is placedin the detection chamber, the detection chamber is sealed, the thickness of the battery cell is detected and recorded through the CCD area array measurement system, the detection chamber is vacuumized, the thickness of the battery cell is detected again and recorded, and whether the battery cell is qualified or not is judged by comparing battery cell thickness data before and after the detectionchamber is vacuumized. According to the invention, more than 30 cells can be detected at one time, the detection efficiency is high, and application to actual production is facilitated. According to the invention, the CCD detection system is adopted for surface detection, so that the result is more real and accurate; the battery cell is vertically placed, the influence of gravity on two sides is extremely small, the thickness of the battery cell is obvious, and the bad detection accuracy is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method and a device for detecting the airtightness of a battery cell. Background technique [0002] The existing electrical air tightness detection methods are mostly realized by the following methods: Proofread the laser thickness measurement system, set the drift value and a correction coefficient, pull out the sliding stage and put the soft package battery to be tested on the sliding stage First, there are usually 1-5 soft-packaged batteries, and then the sliding stage loaded with soft-packaged batteries is pushed into the testing room and the testing room is sealed, the on-off valve is opened, and the testing room is quickly evacuated. Detect the thickness change of the flexible packaging battery, and record the vacuum degree of the testing room and the battery thickness change with the detection time, and judge whether it is a good product according to the se...

AI Technical Summary

Problems solved by technology

[0004] 1) The production efficiency is low, and only a small number of batteries can be measured at a time, which is difficult to apply to actual production;

[0005] 2) The existing technology uses laser thickness measurement system to measure one point or several points, and the measurement data is relatively one-sided;

[0006] 3) The battery cells in the prior art are placed horizontally for detection, and the thickness of the bottom surface does not change significantly due to its own gravity after vacuuming, so there is a risk of missed detection;

[0007] 4) The existing technology is to detect immediately after final sealing on the mobile phase degasser, and there is a possibility of false sealing of the battery cell

lead to the risk of missed detection

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