BATTERY AND METHOD FOR MANUFACTURING SPIRAL ELECTRODE GROUP FOR USE THEREIN

摘要

Assuming the thickness of an electrode laminate (7) comprising a stripe positive pole plate (2), a stripe negative pole plate (3), and a pair of separators (4A, 4B) interposed therebetween is t, the maximum diameter in the transverse section of a spiral electrode group (1, 30, 33) wound with the electrode laminate (7) is W, and a coefficient having a value of 0.005-0.05 preset based on the expansion coefficient of each active substance of the positive and negative pole plates (2, 3) is k, the spiral electrode group (1, 30, 33) is wound to satisfy a relation L=2tpi+Wxk, where L is the difference between circumferential lengths on an inner circumferential side and on an adjacent outer circumferential side of the electrode laminate (7) thus wound.