This device can realize the automatic size measurement of 3C batteries, including battery thickness, width, length, pole ear distance, pole ear distance, pole ear glue exposed and other dimensions. It is mainly composed of several functional modules: feeding module, pole shaping module, thickness measurement module, CCD visual detection module, blanking module, NG selection module and so on. High precision industrial CCD camera and dual telecentric lens are used to detect the size of the battery. The electrode shaping module adopts ceramic rolling of the electrode ear to ensure that the electrode ear is not scratched and to achieve the purpose of flat ear. Thickness measurement module, using high-precision dial meter, to ensure that different thickness of the battery under the specified pressure to automatically complete the thickness of the cell; NG automatic sorting module can accurately realize the automatic sorting of good and bad products.