Patent ID: 7501202
Filing Date: 2009-03-10
Classification: H01M,Y02E,Y02P

Abstract:
1. A lithium secondary cell, comprising: an internal electrode body including a positive electrode plate and a negative electrode plate wound or laminated through a separator disposed between the positive and negative electrode plates, and a nonaqueous electrolyte solution impregnating the internal electrode body; a cell case housing the internal electrode body; at least one electrode cap sealing the internal electrode body inside of the cell case at least at one end of the cell case, said electrode cap being provided with a plate member and has a pressure release; an external terminal member protruding onto the surface of the electrode cap to lead current outside of the cell, the entirety of the external terminal member being shielded from or not in contact with an interior of the cell case; and an internal terminal member directly contacting the external terminal member and brought into connection with the internal electrode body and taking current from the internal electrode body, the entirety of the internal terminal being shielded from or not in contact with an exterior of the cell case, wherein at least two members selected from the group consisting of the plate member, the external terminal member and the internal terminal member are joined together for construction, and said external terminal member has a hollow portion that functions as a pressure release path of said pressure release.