| 摘要 |
A secondary battery comprises a case which includes a frame and a film covering an opening of the frame to form a space inside the frame, and a unit battery cell placed in the space inside the case. The frame has a higher hardness than the film. The frame can be formed with plastic or steel, and the film can be formed of polycarbonate (PC), polyethylene (PE), polyethylene terephthalate (PET), or polyvinylchloride (PVC). The thickness of the film is maintained within 0.03 to 0.3 mm, and a mark can be formed on the film. A contact terminal is formed on the case, and the contact terminal is electrically connected to a unit battery cell so as to connect the battery pack to an applied device. The frame can be formed in a divided manner, and the film can be bound to one surface placed adjacent to the opening of the frame, or on the latter surface and an outer circumferential surface of the frame. The frame can be formed as one body, and the film can be bound to a surface placed adjacent to the frame.
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