Manufacturing method of electrode plate, manufacturing method of secondary battery, electrode plate, and secondary battery

Abstract

According to the present disclosure, it is possible to inhibit the electrically conductive foreign substance from falling off and being peeled off from the electrode plate that has been already manufactured, so as to contribute in improving the safety property of the secondary battery. The manufacturing method of the electrode plate herein disclosed includes a precursor preparing step for preparing an electrode precursorA including an active material provided area Ain which an electrode active material layeris provided on a surface of the electrode coreand including a core exposed area Ain which the electrode active material layeris not provided and the electrode coreis exposed, and an active material provided area cutting step for cutting the active material provided area Aby a pulse laser, and a core exposed area cutting step for cutting the core exposed area Aby the pulse laser. Then, in the case where the pulse width (ns) of the pulse laser is represented by X and the lap rate (%) is represented by Y for the core exposed area cutting step, a condition represented by Y≥−3 log X+106 is satisfied. According to the manufacturing method of the electrode plate as described above, it is possible to inhibit the electrically conductive foreign substance from falling off and being peeled off from the electrode plate that has been already manufactured, and thus it is possible to contribute in improving the safety property of the secondary battery.