DEVICE FOR TREATMENT OF NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND PROCESS FOR PRODUCTION OF NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

To melt and diffuse metallic foreign bodies immixed in electrodes of a nonaqueous electrolyte secondary battery before initial charging, electrodes (18) wound with a separator (24) between a cathode plate (20) and an anode plate (22) are placed in a battery case (16) and the battery case (16) is filled with an electrolyte. After the case has been filled, the electrolyte is allowed to permeate into the electrodes(S14). Then, the electrolyte-filled battery (14) is placed in a processing device (10), and fixed by means of a surface pressure between at least 0.1 MPa and 5.0 MPa (S16). Thereafter, the cathode potential is adjusted and held for a period of one hour and 35 hours (S18) while the battery remains fixed, after which the pre-initial charging process is terminated (S20).