US 9,812,742 B2
Manufacturing method for nonaqueous electrolyte secondary battery
Kunimitsu Yamamoto, Toyota (JP); Yukiyoshi Ueno, Toyota (JP); Tomoyuki Mizuno, Toyota (JP); and Junko Ohira, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-ken (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, Aichi-ken (JP)
Filed on Feb. 20, 2015, as Appl. No. 14/627,286.
Claims priority of application No. 2014-034662 (JP), filed on Feb. 25, 2014.
Prior Publication US 2015/0244032 A1, Aug. 27, 2015
Int. Cl. H01M 10/44 (2006.01); H01M 10/0525 (2010.01); H01M 10/058 (2010.01)
CPC H01M 10/446 (2013.01) [H01M 10/058 (2013.01); H01M 10/0525 (2013.01); H01M 2220/20 (2013.01); Y02E 60/122 (2013.01); Y02P 70/54 (2015.11); Y10T 29/49108 (2015.01)] 10 Claims
OG exemplary drawing
 
1. A manufacturing method for a nonaqueous electrolyte secondary battery, the nonaqueous electrolyte secondary battery including
a relief valve,
a negative-electrode active material including graphite, and
a positive-electrode active material including a charge carrier that is held between layers of the graphite at a time of charging,
the manufacturing method comprising:
assembling the nonaqueous electrolyte secondary battery including a positive electrode and a negative electrode; and
performing an initial charging process as first charging on the nonaqueous electrolyte secondary battery, the initial charging process including:
determining whether or not a gas generation amount depends on a charging current value, based on a state of charge or a terminal voltage of the nonaqueous electrolyte secondary battery,
performing charging at a first current value when a gas generation amount generated in the nonaqueous electrolyte secondary battery during the charging does not depend on a charging current value, and
performing the charging at a second current value smaller than the first current value when the gas generation amount depends on the charging current value.