Patent ID: 9722215
Date: 2017-08-01
CPC Classifications: H01M,Y02E,Y02P

Claim:
1. A cylindrical battery, comprising: a cylindrical battery case; and an electrode group including a positive electrode, a negative electrode, and a separator, the positive electrode, the negative electrode and the separator being layered in a direction perpendicular to a center axis of the cylindrical battery case, wherein the electrode group and the battery case define a space communicated from a top to a bottom therebetween, one of the positive electrode and the negative electrode has a current collecting terminal that extends from the electrode group in a direction away from the center axis and from an outer side of the electrode group toward a side surface of the cylindrical battery case and that is in contact with a bottom surface of the cylindrical battery case, the electrode group has a rectangular parallelepiped shape, the one of the positive electrode and the negative electrode is an electrode plate including a current collector, the current collector comprises applied portions where an active material is applied, and an unapplied portion that is linearly formed between the applied portions and has no active material applied thereto, and the current collector is bent into a substantially U shape when viewed from a direction that is perpendicular to the center axis, the substantially U shape having the applied portions and the unapplied portion, the applied portions extending from both ends of the unapplied portion in the direction parallel to the center axis, the applied portions being perpendicular to the unapplied portion.