Monocular vision detection method for dislocation defect of bare cell tab of power battery

Abstract

The invention discloses a monocular vision detection method for a dislocation defect of a naked battery cell tab of a power battery. The monocular vision detection method comprises the steps a to g. The invention has the advantages that: 1, the monocular vision tab dislocation detection method is based on a perspective projection camera model, so that the photographing scheme is simple, a telecentric lens or a telephoto lens is not needed, the cost is low and the space is saved; for example, under the same visual field condition, the working distance of the lens needed by the monocular visiontab dislocation detection method is generally about 50% shorter than that of the telephoto lens needed by a method based on a weak perspective projection camera model, wherein compared with a telecentric lens required by a method based on an orthogonal projection camera model, the working distance is shortened by about 80%, and the cost is reduced by about 98%; 2, three-dimensional target distancemeasurement under the condition of a single camera is realized, and a calculation model is highly matched with the actual situation; and 3, the problem of three-dimensional measurement of the distance from the monocular tab to the side edge of the battery cell is greatly simplified, and the method is easy to understand and implement.

Description

technical field [0001] The invention relates to a monocular visual detection method for the dislocation defect of a bare cell tab of a power battery, and belongs to the technical field of battery production. Background technique [0002] In the field of power battery production, the winding process is the mainstream process of square batteries. In the winding process, the pole piece is first die-cut, and then the cathode pole piece, the anode pole piece, and the two-layer separator are wound on the winding needle in the order of "separator film-cathode pole piece-separator film-anode pole piece". The fit is complete. During the winding process of the battery core, if the thickness of the material is not consistent with the standard thickness, it will cause the dislocation of the tabs, which will affect the assembly and soldering flow capacity of the bare battery in the later process. [0003] At present, the detection of cell tab misalignment is generally summarized as 2 s...

AI Technical Summary

Problems solved by technology

In order to achieve more accurate distance measurement, the method disclosed in Document 1 requires a relatively long shooting distance and a telephoto lens to reduce the perspective effect, takes up a relatively large space, or needs to increase the number of cameras

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