Patent attributes
A secondary battery comprises a bare cell including an electrode assembly composed of positive and negative electrodes and a separator, a can acting as a container for containing the electrode assembly and an electrolyte, and a cap assembly having a cap plate for covering the open upper end of the can and a lead plate coupled to a part of the cap plate, wherein an electrolyte injection hole is positioned on a side of the cap plate. The lead plate has a bottom portion which covers the electrolyte injection hole and at least a part of which is coupled to a surface of the cap plate. Additionally, a part of the lead plate, which corresponds to the electrolyte injection hole of the bottom portion, is removed to form a hole so that a cap which seals the electrolyte injection hole is exposed.
