LITHIUM SECONDARY CELL AND METHOD FOR PRODUCING THE SAME

摘要

A lithium secondary cell wherein an electrode assembly (1) comprising a positive plate and a negative plate that are wound or stacked through a separator and impregnated with a nonaqueous electrolytic solution is contained in a cylindrical cell case (16) having electrode caps at both ends, an elastic body (23) is disposed between the cell case (16) and each of the electrode caps, and the cell case is sealed through a caulking part formed by pressing the portion of the cell case in contact with each of the elastic bodies (23). The relation between the diameter R>body< (mm) of the body portion of the cell case (16) and the diameter R>top< (mm) of each of the caulking parts is expressed by R>body<>R>top<. By strengthening the caulking between the cell case and each of the electrode caps, there is no gaps among the cell case and the electrode caps in the caulking parts, thereby preventing leak of the electrolytic solution and improving the long-term stability and reliability.