| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a secondary battery, precisely determining the quality of electric characteristics of the secondary battery.SOLUTION: A manufacturing method includes (first) determination steps S12-S16 comprising: for each group of batteries including predetermined number of secondary batteries as one set, which has been subjected to an aging step S3 of leaving the batteries in a constant-temperature atmosphere over a predetermined period, a first voltage measurement step S12 of measuring a terminal voltage V3 at the time of reduction in a rising tendency of the terminal voltage rising by a rebound generated after discharging; a second voltage measurement step S14 of measuring a terminal voltage V4 after a first predetermined time S13 from the first voltage measurement step S12; and a step S16 of determining the quality of the secondary batteries based on whether the voltage difference (V4-V3) between the measured voltage V3 in the first voltage measurement step S12 and the measured voltage V4 in the second voltage measurement step S14 is within a previously set threshold value or not. |
