Patent ID: 11876186
Assignee: FDK CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. An alkaline storage battery comprising:
a spiral electrode group that is spirally formed by laminating a positive electrode plate, a negative electrode plate, and a separator, wherein each of the positive electrode plate, the negative electrode plate, and the separator have a belt shape, wherein the separator is arranged between the positive electrode plate and the negative electrode plate so that the negative electrode plate is located on an inner peripheral side of the positive electrode plate at an innermost peripheral portion of the spiral electrode group; and
an outer packaging can having electric conductivity in which the spiral electrode group is accommodated together with an alkaline electrolytic solution,
wherein:
the negative electrode plate comprises a negative electrode core body having a belt shape, a first negative electrode mixture layer coated on an entire surface of an outer peripheral side of the negative electrode core body, and a second negative electrode mixture layer coated on an entire surface of an inner peripheral side of the negative electrode core body;
the negative electrode core body has a burr protruding toward an outer peripheral side of the first negative electrode mixture layer from an innermost edge of an innermost peripheral portion of the negative electrode core body;
a thickness of the first negative electrode mixture layer on an edge portion of the innermost peripheral portion of the first negative electrode core body is smaller than a thickness of a portion other than the edge portion of the first negative electrode mixture layer;
a height of the burr is 30% or less of a thickness of the separator; and
a winding start end of the negative electrode plate is flush with a winding start end of the positive electrode plate; and
a winding end of the negative electrode plate is flush with a winding end of the positive electrode plate.