LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery that is easy to make, has small battery internal resistance and excellent in operational safety. SOLUTION: This is a lithium secondary battery in which an internal electrode body 90 composed by winding a positive electrode plate 60 and a negative electrode plate 61 in a manner not to bring them into contact with each other by interposing a separator 62 formed from a porous polymer is received in a battery case 63 and which uses an organic electrolyte. A pressure releasing mechanism is formed at each of both ends of the battery case 63 in the winding axis direction of the internal electrode body 90. It is preferable that the battery case has a column-like shape.