Patent ID: 6468692
Filing Date: 2002-10-22
Classification: H01M,Y02E,Y02P

Abstract:
A lithium secondary battery comprising:an electrode body obtained by winding or laminating a positive electrode and a negative electrode via a separator, a non-aqueous electrolytic solution, at least one lid, and a battery case accommodating the electrode body and the non-aqueous electrolytic solution, wherein: (1) an elastomer is positioned between two or more members and said members are pressure-welded to each other, or (2) a resin is positioned between two or more members and the two or more members are pressure-welded to each other, and thereby the battery case has a seal between said two or more members,wherein the deformation of the elastomer in the load direction is larger than the spring-back amount of the pressure-welded portion and the stress applied to the elastomer is not smaller than 980 kPa and not larger than a level at which the retention of elasticity of the elastomer becomes 95%.