To provide a manufacturing method of a secondary battery precisely determining the quality of electric characteristics in the secondary battery.
An average value ΔVam is calculated for a voltage difference ΔV between a first voltage V1 across terminals and a second voltage V2 across terminals for each group of batteries (step SA1). Standard deviation σmΔV of the voltage difference ΔV is calculated (step SA2). It is determined that the secondary battery, where the absolute value of the difference between the voltage difference ΔV and the average value ΔVam exceeds a value obtained by multiplying the value of the standard deviation σmΔV by a prescribed value (n), has poor quality in the secondary batteries belonging to the group of batteries (step SA3). A loop determination process is provided. In the loop determination process, a determination cycle for performing the processes SA1-SA3 is newly repeated by a regulated number of times to other secondary batteries except one having poor quality in the secondary batteries belonging to the group of batteries.
COPYRIGHT: (C)2006,JPO&NCIPI
Yuichi Ihi
Tomioka Katsuyuki
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