Lithium battery diaphragm surface flatness detection apparatus and method

Abstract

A diaphragm, which is taken as one of four materials of a lithium battery, gets a large development opportunity, and simultaneously, more higher requirements to performance consistency and appearance flatness are put forward. Quality of the diaphragm directly influences usage performance and safety performance of the lithium battery. A wave and a tippet are key problem points which influence the appearance flatness of the diaphragm. Each diaphragm manufacturer finds a method to overcome the above techncial problem. In a lithium battery diaphragm surface flatness detection apparatus and a method, a unreeling shaft, an infrared detector, a hanging counterweight, a horizontal base and two guide rollers are included. The detection apparatus possesses characteristics that the detection is simple; an operation flow is easy; efficiency high and so on. The surface flatness of the diaphragm can be embodied through a specific value and evaluation is standardized.

Description

technical field [0001] The invention belongs to the detection field of lithium battery diaphragms, and in particular relates to a detection device and method for the surface smoothness of lithium battery diaphragms. technical background [0002] Traditional fuel vehicles are currently one of the main sources of air pollution. Improving emission standards and other means can only alleviate the degree of pollution, but cannot fundamentally eliminate the source of pollution. The new energy automobile industry has always been an industry that the automobile industry and even governments of various countries are keen to invest in. The data lithium battery report predicts that the output of electric vehicles will reach 13.14 million in 2020, which is 5.5 times that of 2010. Among them, the output of plug-in hybrid electric vehicles will increase by 35 times to 1.4 million, and the output of pure electric vehicles will reach 750,000, an increase of 75 times. [0003] Lithium batte...

AI Technical Summary

Problems solved by technology

[0004] As one of the four major materials of lithium batteries, the separator has also obtained great opportunities for development, but at the same time, more and higher requirements have been put forward in terms of performance consistency and appearance flatness. The quality of the separator will directly affect the lithium battery. The use performance and safety performance, among them, the wave and vertical edge are the key problems that affect the smoothness of the diaphragm appearance, and it is also a technical problem that major diaphragm manufacturers have been struggling to seek breakthroughs. However, the current domestic detection of waves and vertical edges is only Judging by manually pulling the membrane, that is, pulling out a 1m-2m membrane from the finished roll of membrane, and subjectively judging the quality of the wave / vertical edge by human eyes

The judgment of good and bad is too affected by subjectivity, and there is no good objective test method, so it is impossible to form a specific judgment standard

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