Title:
MANUFACTURING METHOD FOR SECONDARY BATTERIES
Document Type and Number:
Japanese Patent JP2017106867
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method for secondary batteries that can accurately detect any battery being short-circuited at a short-circuiting checkup step and, after a discharging step, shorten the length of time taken until the completion of the short-circuiting checkup step.SOLUTION: A manufacturing method for a secondary battery 1 comprises an initial charging step S2 of initially charging the secondary battery 1 to a first SOC, a first aging step S3 of letting the secondary battery 1 standing alone at a first temperature T1 of 35 to 85°C, a discharging step S4 of forcibly discharging the secondary battery 1 to a second SOC, a second aging step S5 of letting the secondary battery 1 stand alone at a second temperature T2 of 35 to 85°C, and a short-circuiting checkup step S6 of determining the presence or absence of internal short circuiting on the basis of the relative level of a voltage drop α by letting the secondary battery 1 stand alone at a third temperature T3 lower than the second temperature T2 and in a state of terminals being kept open.SELECTED DRAWING: Figure 3
Inventors:
YAMADA NOBUHIRO
Application Number:
JP2015242426A
Publication Date:
June 15, 2017
Filing Date:
December 11, 2015
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
G01R31/36; H01M10/04; H01M10/48
Attorney, Agent or Firm:
Patent Business Corporation Cosmos Patent Office