ELECTRODE CURRENT COLLECTOR AND SECONDARY BATTERY

The present disclosure can improve activation stability of the current cut-off function of the electrode current collector. The electrode current collector 10 disclosed herein includes a sheet-like resin base material 12, and a metal thin film 14 provided on a surface 12a, 121 of the resin base material 12. in the electrode current collector 10 disclosed herein, the surface 12a. 12b of the resin base material 12 in contact with the metal thin films 14 has a surface rough ness Rz of 2 μm or more. This can largely improve the adhesion between the resin base material 12 and the metal thin film 14. Thus, when abnormal heat generation occurs, the resin base material 12 is melted and deformed so as to pull the metal thin film 14, thereby breaking the metal thin films 14. As a result, the current cut-off function can be stably activated, and the progression of abnormal heat generation can be substantially prevented, as appropriate.