Patent ID: 7806943
Filing Date: 2010-10-05
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A method for producing a secondary battery including an electrode plate group in which a positive electrode plate and a negative electrode plate are wound or stacked with a separator interposed therebetween and a battery case in which the electrode plate group and an electrolyte are contained, the method comprising the steps of: a) forming a positive electrode active material layer on a surface of a current collector core material of a positive electrode and a negative electrode active material layer on a surface of a current collector core material of a negative electrode; b) forming a porous protective film on a surface of at least one of the positive electrode active material layer and the negative electrode active material layer to form a positive electrode plate and a negative electrode plate; c) forming, after the step b), a plurality of grooves at least in a surface of the porous protective film; d) forming, after the step c), an electrode plate group by winding or stacking the positive electrode plate and the negative electrode plate with a separator interposed therebetween; and e) placing and injecting, after the step d), the electrode plate group and the electrolyte in the battery case, and sealing the battery case, wherein in the step c), the plurality of grooves are formed simultaneously in the surface of the porous protective film and in a surface of the at least one of the active material layers.