US 8,940,428 B2 · Separator, a lithium rechargeable battery using the same and a method of manufacture thereof

Abstract

A separator, a lithium rechargeable battery using the separator, and a method of manufacturing the lithium rechargeable battery. More particularly, a separator in which a plurality of porous films having different strength from one another are disposed between a positive electrode plate and a negative electrode plate. A porous film having a higher tensile strength is disposed at a region adjacent to the negative electrode plate, and the other porous film is disposed adjacent the positive electrode plate. The porous film having the higher tensile strength has smaller holes and/or is thicker than the other porous film. The separator improves the stability of the battery by improving the prevention of an electrical short occurring between the two electrode plates of the electrode assembly, and a lithium rechargeable battery using the same.

Claims6

Dependent claims

A lithium rechargeable battery comprising:

an electrode assembly having a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate;
a can which contains the electrode assembly;
and
a cap assembly which seals an upper opening portion of the can,
wherein the separator is constructed by overlapping at least two porous films having a different pore size, and a space separating the porous films, the space being filled with an electrolyte,
wherein a porous film face-to-face with and adjacent to the negative electrode plate has a smaller pore size than a porous film face-to-face with and adjacent to the positive electrode plate, the porous film face-to-face with and adjacent to the negative electrode plate and the porous film face-to-face with and adjacent to the positive electrode plate having a different tensile strength from each other.

3 more elements

Dependencies are inferred from the claim text.

Separator, a lithium rechargeable battery using the same and a method of manufacture thereof

Life of this patent

Separator, a lithium rechargeable battery using the same and a method of manufacture thereof

Life of this patent

Abstract

Claims6