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

Claim 3:
4. A method for manufacturing an alkaline storage battery, comprising:
a coating step of coating a first negative electrode mixture layer onto one an entire surface of a negative electrode core body base material having a belt shape extending in a longitudinal direction, and coating a second negative electrode mixture layer onto an opposite entire surface of the negative electrode core body base material;
an adjustment step of adjusting, after the coating step, the first negative electrode mixture layer so that a thickness of the first negative electrode mixture layer in a first region containing a center of a width of the negative electrode core body base material is smaller than a thickness of the first negative electrode mixture layer in a second region other than the first region, the width being in a direction perpendicular to the longitudinal direction;
a cutting step of cutting, after the adjustment step, the negative electrode core body base material, the first negative electrode mixture layer, and the second negative electrode mixture layer in the longitudinal direction at the center in the short direction of the negative electrode core body base material, and then cutting the negative electrode core body base material, the first negative electrode mixture layer, and the second negative electrode mixture layer in a short direction perpendicular to the longitudinal direction to produce the a negative electrode plate having a belt shape;
a winding step of laminating and winding in the short direction, after the cutting step, the negative electrode plate, a belt-shaped positive electrode plate, and a belt-shaped separator arranged between the positive electrode plate and the negative electrode plate to produce a spiral electrode group having a spiral shape 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 a winding start end of the negative electrode plate is flush with a winding start end of the positive electrode plate, and that a winding end of the negative electrode plate is flush with a winding end of the positive electrode plate; and
an insertion step of inserting, after the winding step, the spiral electrode group into an outer packaging can having electrical conductivity together with an alkaline electrolyte solution,
wherein:
in the winding step, the spiral electrode group is produced so that the first negative electrode mixture layer is located on an outer peripheral side of the negative electrode plate, and the center of the negative electrode core body base material cut in the cutting step becomes an innermost edge of an innermost peripheral portion of the negative electrode plate.