WELDING METHOD, WELDING APPARATUS, METHOD OF MANUFACTURING BATTERY, AND BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a welding method and welding apparatus that can suitably carry out welding of an electrode plate and a current collecting plate; to provide a method of manufacturing a battery; and to provide a battery.

SOLUTION: When a positive electrode current collecting plate 110 is welded to a positive electrode plate P, a laser is used which has an irradiation center region Z and a high-intensity outer periphery region Y. The high-intensity outer periphery region is higher in laser intensity than the irradiation center region Z. The laser is scanned so that: an irradiation center region X is scanned at the center of a welding width direction; and the high-intensity outer periphery region Y is scanned on both sides of the center thereof. Thus, projecting portions X2 and X3 appear, each of which projects toward a laser irradiation direction in a cross section that is perpendicular to a laser scanning direction at a portion to be welded, in a cross-sectional shape of a portion to be affected by heat. Moreover a recessed portion X1 appears between the projecting portions X2 and X3.

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