Bright spot inspection device for lithium battery diaphragm

Abstract

The invention belongs to the field of the inspection tool die for the inspection of the bright spot on diaphragm surface in the production of lithium battery diaphragms, and more specifically provides a bright spot inspection device for a lithium battery diaphragm. The device includes a light box with built-in light sources; one surface of the light box is provided with a transparent plate for the light from the light sources to pass through; an unwinding shaft for sleeve arrangement of a diaphragm roll is arranged at one end of the transparent plate, and the axis of the unwinding shaft is parallel to the transparent plate; the unwinding shaft is arranged above the transparent plate; a guide roller is fixed on one end of the transparent plate where the unwinding shaft locates; the axis of the guide roller is parallel to the axis of the unwinding shaft; a gap formed by the guide roller surface and the transparent plate surface forms a passage channel for passing of the diaphragm pressing close the transparent plate surface; and the transparent plate is provided with scales along a direction perpendicular to the axis of the unwinding shaft. The device can effectively avoid the influence of light on the inspection results, realize rapid test operation of a plurality of diaphragm rollers, and greatly improve the inspection efficiency.

Description

technical field [0001] The invention belongs to the field of inspection tooling molds for inspecting bright spots on membrane surfaces during the production of lithium battery diaphragms, and in particular relates to a bright spot inspection device for lithium battery diaphragms. Background technique [0002] Due to the production process of the dry biaxially stretched lithium battery separator, the polymer crystallization points in the raw materials will form tiny flaws on the surface of the separator, commonly known as "bright spots". More bright spots will have a greater impact on the performance of the diaphragm. During the inspection process, specific inspection steps and standards will be used for random inspection. At present, the conventional inspection method is to use manual ruler measurement supplemented by section-by-section inspection methods, specifically: after obtaining the diaphragm film roll to be inspected, use a ruler to measure the length and width of a ...

AI Technical Summary

Problems solved by technology

Due to the small bright spot, affected by the angle and brightness of the ambient light on site and the manual flattening of the diaphragm by the inspector (occasionally uneven and jittery), the leak detection of the bright spot of the leak meter occurs from time to time.

In addition, the above-mentioned inspection method is measured by a ruler and inspected roll by section. At the same time, the angle of the diaphragm and the light must be constantly changed to facilitate the counting of the number of bright spots. There are too many operational factors to be considered by the inspectors on site, and the inspection efficiency is obviously extremely low.

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