Patent ID: 8227110

Claim:
A secondary battery, comprising: a bare cell having an electrode assembly including two electrodes and a separator arranged between the two electrodes, a cell container having an opening and adapted to contain the electrode assembly, and a cap assembly adapted to cover the opening; and a removable accessory unit having a protective circuit module and adapted to be electrically connected to the bare cell via an electrode terminal from outside of the bare cell; the protective circuit module includes: at least one safety device, a first mechanical connection member, a second mechanical connection member and an electrical connection member arranged on one side facing the cap assembly and at least one outer electrical terminal arranged on another side thereof; the accessory unit includes a molding resin exposing the first mechanical connection member, the second mechanical connection member, the electrical connection member, and the outer electrical terminal; and the first mechanical connection member of the accessory unit is mechanically attached to the cap assembly with a first adhesive member, and the second mechanical connection member is mechanically and electrically attached to the cap assembly with a second adhesive member, the first and second adhesive members having a first bond strength between the first and second mechanical members and the first and second adhesive members and a second bond strength, greater than the first bond strength, between the cap assembly and the first and second adhesive members.