US 11,936,003 B2
Battery
Shuji Ogawa, Fukutsu (JP); Takafumi Tsukagoshi, Kasai (JP); Kazuya Ikeshita, Minamiawaji (JP); and Kazuki Hiramatsu, Kasai (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Oct. 13, 2021, as Appl. No. 17/499,873.
Claims priority of application No. 2020-177173 (JP), filed on Oct. 22, 2020.
Prior Publication US 2022/0131197 A1, Apr. 28, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 10/0587 (2013.01) [H01M 10/0525 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A battery comprising:
a wound electrode assembly, wherein
the wound electrode assembly has a flat shape,
the wound electrode assembly includes a first separator, a positive electrode plate, a second separator, and a negative electrode plate,
the first separator, the positive electrode plate, the second separator, and the negative electrode plate are stacked in this order and then wound spirally,
in a cross section perpendicular to a winding axis of the wound electrode assembly,
the first separator has a first winding start edge inside an innermost circumference of the wound electrode assembly,
the second separator has a second winding start edge inside the innermost circumference of the wound electrode assembly,
the first winding start edge faces the second winding start edge, in a direction parallel to a straight line connecting two points located farthest apart from each other on an outline of the wound electrode assembly, with the winding axis interposed therebetween, and
the first winding start edge is located apart from the second winding start edge.