Lithium battery diaphragm conductivity testing device

Abstract

The invention discloses a lithium battery diaphragm conductivity testing device which comprises a first testing mechanism, a second testing mechanism, a third testing mechanism and a testing platform, and the first testing mechanism, the second testing mechanism and the third testing mechanism are installed on the testing platform. The lithium battery diaphragm conductivity testing device is compact in structure and ingenious in design, conductivity testing can be conducted on the folded diaphragm through the first testing mechanism, conductivity testing can be conducted on the surrounding diaphragm through the second testing mechanism, and the third testing mechanism can test the diaphragm under stretching rotation and under the condition that the stretching force is changed. Diversification of tested diaphragm conductivity information is increased, accuracy of diaphragm conductivity test data is achieved, diaphragm test efficiency can be improved, and time is saved.

Description

technical field [0001] The invention relates to the technical field of testing lithium battery diaphragms, in particular to a conductivity testing device for lithium battery diaphragms. Background technique [0002] The separator is used as an insulating material to isolate the positive and negative electrodes in the lithium battery without short-circuiting the battery. At the same time, because the separator has a certain pore structure and allows lithium ions to pass through freely, the performance of the separator directly affects the performance of the battery, especially It plays an extremely important role in the safe use of lithium batteries. In the manufacturing process of lithium-ion batteries, it is necessary to conduct a short-circuit test on the winding cell. If the breakdown voltage of the diaphragm is too small, the diaphragm will be broken down during the test, and the winding core will be scrapped, which will reduce the battery yield and cost waste. When the...

AI Technical Summary

Problems solved by technology

When directly testing the conductivity of the diaphragm, there is a large error between the obtained result and the real value. Because the diaphragm itself is relatively thin, it is difficult to accurately control the distance between the electrodes. In addition, the roughness of the contact surface between the electrode plate and the diaphragm also significantly affects the test. Accuracy of results

Therefore, to strictly control the distance between the electrodes and the roughness of the contact surface between the electrodes and the diaphragm, many equipments are required, many testing procedures are required, and the testing cost is high.

At present, most of the general-purpose surface resistance testing equipment is used to evaluate the lithium battery separator. Due to the particularity of the material of the separator, the general-purpose surface resistance testing equipment is more complicated when testing the separator, the operation is cumbersome, the cost is high, and the test method is single. The error is large, and some even have potential safety hazards

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