Toyota Jidosha Kabushiki Kaisha

Norihiro Jikuri

Kazuo Ikuta

Shinichiro Kitsunai

Disclosed is method for producing a secondary battery, capable of selection of a secondary battery having a defect caused by a micro short-circuit with high accuracy. A step for producing a secondary battery includes an inspection step for selecting the secondary battery having the defect among multiple secondary batteries. In the inspection step, a short circuit resistance is calculated based on capacitances of the multiple secondary batteries calculated before self-discharge inspection, a time required for the self-discharge inspection, first and second reference voltages calculated from open circuit voltages measured before and after the self-discharge inspection in the multiple secondary batteries, and first and second voltages which are open circuit voltages of one selected from the multiple secondary batteries measured before and after the self-discharge inspection. If the short circuit resistance is equal to or lower than a predetermined standard value, the selected secondary battery is determined to have the defect.

Growing community of inventors

Okazaki, Japan

Norihiro Jikuri