Apparatus and method for testing conductivity of battery diaphragm

Abstract

The application discloses an apparatus and method for testing the conductivity of a battery diaphragm. The apparatus comprises a conductance cell housing, a conductance cell cover, a diaphragm clamp, and a conductivity meter. The conductance cell housing is in a cylindrical shape with one open end, comprises a first circular conductance electrode piece at the inner surface of the bottom, and a first electrode external interface electrically connected with the first circular conductance electrode piece and on the outer surface. The two electrode external interfaces are used to be connected with the conductivity meter. The conductance cell cover is detachably inserted and fixed to the open end of the conductance cell housing, comprises a second circular conductance electrode piece at the inner surface, and a second electrode external interface electrically connected with the second circular conductance electrode piece and on the outer surface. A vacuum valve port and a liquid injection valve port are arranged on the sidewall of the housing. The diaphragm clamp is an interlocked annular structure, has an outer diameter matching the inner diameter of the conductance cell housing, is in parallel with the two conductance electrode pieces and coaxial with the two conductance electrode pieces. The apparatus is simple in structure and easy to operate and can accurately and accurately measure the conductivity and the resistance of the diaphragm.

Description

technical field [0001] The present application relates to the field of testing equipment for lithium-ion battery diaphragms, in particular to a device and method for testing the conductivity of battery diaphragms. Background technique [0002] In recent years, the development of new energy has attracted attention, especially the rapid development of lithium-ion batteries, which has become the focus of attention in the new energy industry. Lithium-ion batteries are composed of four key materials: positive electrode, negative electrode, diaphragm and electrolyte. The diaphragm is located between the positive and negative electrodes, which plays an isolation role, prevents direct contact between the positive and negative electrodes and short circuit, and allows ion conduction and prevents electronic conduction. Microporous structure: The microporous structure of the diaphragm restricts the ion conduction rate of lithium ions, which directly affects the performance of lithium io...

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Problems solved by technology

[0004]The above method is more complicated to operate, and it is necessary to test the resistance value of at least four layers of diaphragms separately, and the resistance value of one layer, two layers, three layers and four layers can be compared It is easy to fit a linear curve and calculate the surface resistance of the diaphragm; the number of tests is large, the operation process is complicated, the test takes a long time, and the test efficiency is low; and four or more tests require a large amount of diaphragm samples. It is also the average value of the surface resistance of multiple sample diaphragms

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