Special fixture for puncture test of lithium battery diaphragm

Abstract

The invention relates to the technical field of lithium battery tests, particularly to a special fixture for a puncture test of a lithium battery diaphragm. The special fixture includes a B type solder tip and a bottom base, an upper compression ring is arranged on the bottom base, and the B type solder tip is arranged on the upper compression ring through a fixing structure; and a holder is clamped at an outer side of the bottom base, and a compression spring is connected between the holder and the fixing structure. After adoption of the abovementioned structure, the special test fixture is used in a puncture test of a diaphragm, a vertically downward motion requirement, testing of a limited range within precise height of 2mm and effective fixing of the diaphragm can be effectively and rapidly realized. At the same time, operation instability existing in a test by an inspector is reduced, test misoperation and repeatability are reduced, and accuracy of testing is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium battery testing, in particular to a special jig for point rupture testing of lithium battery separators. Background technique [0002] As a core material of the lithium-ion battery, the diaphragm is used to separate the positive and negative electrodes of the battery, preventing direct contact between the positive and negative electrodes and causing safety problems. At the same time, its microporous structure facilitates the passage of electrolyte ions during the formation process. In addition, its thermal stability can also ensure the safety performance of the battery when it fails at high temperature. Therefore, its performance directly determines the cross-sectional structure and internal resistance of the battery, which in turn directly affects the electrochemical performance of the battery. Therefore, it is particularly important to detect the raw materials of the diaphragm before use. For ...

AI Technical Summary

Problems solved by technology

In the actual test, there are the following shortcomings: 1. The diaphragm is placed on the 2mm thick hollow gasket without a fixed point, and the diaphragm is easy to slide, which causes the instability and repeatability of the test; 2. The test is manually controlled vertically downward There is instability in the point breaking behavior, which can easily make the point breaking circle irregular and cause inaccurate test data; 3. Because the electric soldering iron is a heating test, it requires the rapidity of the test process to detect instantaneous test results

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