Secondary battery and method for producing the same

Details Secondary battery and method for producing the same Secondary battery and method for producing the same

2008-07-16

2010-10-05

Yuan, Dah-Wei D (Department: 1795)

Metal working

Method of mechanical manufacture

Electrical device making

C029S623100, C029S623300, C429S209000, C429S094000

Reexamination Certificate

active

07806943

ABSTRACT:
A secondary battery includes an electrode plate group (1) in which a positive electrode plate (2) and a negative electrode plate (3) are wound or stacked with a separator (4) interposed therebetween and a battery case (7) in which the electrode plate group (1) and an electrolyte are contained. At least one of the positive electrode plate (2) and the negative electrode plate (3) includes a porous protective film (28) formed on a surface of an active material layer. In a surface of the at least one of the electrode plates on which the porous protective film (28) is provided, a plurality of grooves (10) are formed, and the grooves (10) are also formed in the surface of the active material so that each of the grooves (10) extends from the surface of the porous protective film (28) to the surface of the active material layer.

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