Patent ID: 7147962
Filing Date: 2006-12-12
Classification: H01M,Y02E,Y02P,Y02T,Y10T

Abstract:
1. A lithium secondary battery comprising: an internal electrode body formed by winding a positive electrode and a negative electrode on an outer peripheral wall of a hollow cylindrical winding core; a cylindrical battery case containing the internal electrode body inside; nonaqueous electrolyte solution contained in said case and contacting said positive electrode and said negative electrode; at least one electrode cap sealing said internal electrode; and at least one pressure release hole positioned in at least one of first and second ends of said cylindrical case, wherein a position of said pressure release hole corresponds with a center axis of said winding core; wherein the capacity (C) of said internal electrode body is not less than 2 Ah, and said pressure release hole's sectional area (S and wherein the values given by dividing said pressure release hole's sectional area (S