US 12,438,197 B2
Non-aqueous electrolyte solution secondary battery and manufacturing method of non- aqueous electrolyte solution secondary battery
Daisuke Nishide, Kobe (JP); Azusa Nakanishi, Toyota (JP); Hideki Sano, Ikeda (JP); and Naoto Onodera, Kobe (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Mar. 23, 2022, as Appl. No. 17/702,722.
Claims priority of application No. 2021-057179 (JP), filed on Mar. 30, 2021.
Prior Publication US 2022/0320594 A1, Oct. 6, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 4/04 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 10/0587 (2013.01) [H01M 4/0447 (2013.01); H01M 10/0525 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A manufacturing method of a non-aqueous electrolyte solution secondary battery that comprises
a flat-shaped wound electrode body in which a band-shaped positive electrode plate and a band-shaped negative electrode plate are wound with a band-shaped separator interposed therebetween,
a non-aqueous electrolyte solution, and
a battery case accommodating the wound electrode body and the non-aqueous electrolyte solution,
the method comprising:
assembling, in which the wound electrode body and the non-aqueous electrolyte solution are accommodated in the battery case to construct a secondary battery assembly; and
initial charging, in which initial charging of the secondary battery assembly is performed, wherein
in the initial charging,
the initial charging is started, with the secondary battery assembly restrained or not restrained in a thickness direction of the wound electrode body;
when a negative electrode potential of the secondary battery assembly reaches 0.6 V with respect to a lithium metal reference (vs. Li/Li+), a restraint force P1 is applied to the secondary battery assembly, wherein the restraint force P1 is greater than a restraint force applied before the negative electrode potential reaches 0.6 V;
the restraint force P1 is applied to the secondary battery assembly until the negative electrode potential reaches at least 0.3 V with respect to the lithium metal reference (vs. Li/Li+);
a restraint force P2 is applied to the secondary battery assembly, when the negative electrode potential reaches 0.3 V with respect to the lithium metal reference (vs. Li/Li+); and
a ratio (P2/P1) of the restraint force P1 and the restraint force P2 is 0.8 or more and 1.2 or less.