CURRENT COLLECTOR AND APPLICATION THEREOF

The present invention provides a current collector and an application thereof. A first aspect of the present invention provides a current collector including M metal layers and N polymer layers. The metal layer and the polymer layer are stacked, where L metal layers includes a tab connection region and a non-tab connection region and a thickness of the tab connection region is greater than that of the non-tab connection region, and M≥1, N≥1, L≥1, and M≥L. The present invention provides a current collector, which effectively improves the welding strength of the tab by performing a thickening treatment on the tab connection region for connecting the tab in the metal layer, thereby improving the binding force between the tab and the current collector, reducing the contact impedance of the tab connection region, and improving the connection qualified rate between the tab and the metal layer.