Lithium secondary battery

摘要

A lithium secondary battery includes: a bare cell having an electrode assembly and a case for containing the electrode assembly; a protection circuit module connected to the bare cell; and a cover enclosing the protection circuit module and the bare cell and having an external terminal electrically connected to electrodes of the electrode assembly, wherein a part of the cover is a molded portion made of resin using a mold.

主权项

1. A lithium secondary battery, comprising:
a bare cell having an electrode assembly and a case containing the electrode assembly, the bare cell comprising a plurality of major surfaces separated by a plurality of minor surfaces; a protection circuit module disposed on one of the plurality of minor surfaces and electrically connected to the bare cell; an external terminal electrically connected to the protection circuit module; a hard cover exposing the external terminal and a portion of the protection circuit module with the portion being completely overlapped by the external terminal, and the hard cover covering the protection circuit module and covering the bare cell, the hard cover comprising an inner surface facing towards the bare cell and an outer surface disposed opposite to the inner surface and facing away the bare cell; and a molded member made of resin and the molded member covering the protection circuit module and completely covering at least two of the plurality of minor surfaces which are different from the one of the plurality of the minor surfaces on which the protection circuit module is disposed, the molded member not disposed between the bare cell and the inner surface of the hard cover, wherein said hard cover has a pair of cover components to cover the plurality of major surfaces of the bare cell, wherein said pair of cover components are first and second sub hard covers made of metal or resin, wherein each of the first and second sub hard covers has two side cover portions extending respectively from two opposite long side edges of wide surfaces of the each of the first and second sub hard covers and enclosing at least one of the plurality of minor surfaces of the bare cell, wherein the two side cover portions of the each of the first and second sub hard covers have notches along their longest edges, and wherein both of the side cover portions having the notches are engaged by overlapping.