Radian testing device for battery diaphragm

Abstract

The invention discloses a radian testing device for a battery diaphragm. The radian testing device comprises a test table, a tension mechanism, a radian measuring scale, two sets of compression mechanisms and two locating blocks. The two sets of compression mechanisms are arranged at the two ends of the test table respectively, the two locating blocks are arranged beside the two sets of compression mechanisms respectively, the tension mechanism is arranged between the two compression mechanisms, and the radian measuring scale is arranged between the two sets of compression mechanisms. When the radian testing device is used, the diaphragm is paved on the test table and is located by the two locating blocks first, the two sets of compression mechanisms tightly compress the two ends of the diaphragm respectively, the tension mechanism presses the diaphragm to provide simulation tension for the diaphragm, and then the radian is read through the radian measuring scale. The measuring principle of forming one line through two points is adopted, the systematic deviation is small, and the test precision is improved. In addition, the tension mechanism simulates the practical situation, so that the measured radian has more reference significance. The uniform measuring device is adopted for testing the radian of the diaphragm, the uncertain factors caused by artificial participation are few, and therefore, the measuring accuracy is improved while the measuring efficiency is increased.

Description

technical field [0001] The present application relates to the field of battery diaphragm testing equipment, in particular to a device for testing the arc of a battery diaphragm. Background technique [0002] A lithium battery consists of a positive electrode, a negative electrode, a separator, and an electrolyte. As one of the four major materials of lithium batteries, the separator accounts for about 20% of the entire battery cost. In the production process, the basic parameters of diaphragm detection include: thickness, width, surface density, radian, etc. Among them, the curvature of the diaphragm directly affects the quality of the diaphragm winding, which in turn affects the use quality of the lithium battery. [0003] At present, the radian test method commonly used in the lithium-ion battery separator industry is as follows: (1) intercept a certain length, usually 1.3m long separator as a sample; (2) gently spread the sample strip on a smooth, not easy to On the fl...

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Problems solved by technology

[0004] The existing radian test method has the following defects: (1) The tension of the sample diaphragm cannot be controlled after it is flattened. Generally, natural stretching is used or uncertain tension is applied by hand, resulting in a large measurement error; (2) because the measuring ruler, that is, 15mm The long steel ruler is opaque. If the radian of the sample to be measured is opposite to the measuring ruler, it will be blocked by the measuring ruler and cannot be read, which will cause the sample to be invalid; (3) the steel ruler is an ordinary distance measuring tool, and its accuracy is limited. And under gravity and other conditions, it will have a certain arc, so the error of the whole test system is relatively large; (4) Manual sampling, steel ruler building, film pulling test, and visual reading are too much manual participation in the whole process, which brings a lot of problems. Uncertainty factor, and extremely low efficiency

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