Patent ID: 6509114
Filing Date: 2003-01-21
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
A cylindrical lithium-ion battery, comprising:an electrode winding group where a strip-shaped positive electrode having a positive collector applied with positive electrode active material from/in which lithium ions can be released/occluded through charging/discharging and a strip-shaped negative collector applied with negative electrode active material in/from which lithium ions can be occluded/released through charging/discharging are wound through a strip-shaped separator through which lithium ions can pass; a cylindrical battery container in which the electrode winding group is accommodated; and a lid plate for sealing the battery container having an internal pressure reducing mechanism for discharging gas according to an increase in internal pressure of the battery container, wherein, when an average diameter of the electrode winding group is A mm, an inner diameter of the cylindrical battery container is B mm, a longitudinal length of the electrode winding group is H mm, and the number of windings of the electrode winding group is W, a calculation value K calculated in accordance with the following Formula (1) is 0.89 or more: K=(Bâˆ’A)Ã—10000/(WÃ—H)â€ƒâ€ƒFormula (1).