Abstract: A case for a secondary battery. The case for a secondary battery has a space in which an assembled battery unit including a positive electrode plate, a separator, and a negative electrode plate, is accommodated, and sealing portions welded along the periphery of the space, wherein at least one notch is present in the sealing portions.

Abstract: A method for manufacturing a case for a secondary battery includes preparing a case material in a plate state; setting a plurality of sections on the case material, each section including parts for forming a pan for a battery main body, a gas receiving portion disposed at a side of the pan, a path connecting the pan and the gas receiving portion, and a cover portion covering the pan and the gas receiving portion together; forming the pan of the battery main body, the gas receiving portion, and the path by molding the case material; and severing each section from the case material.

Abstract: A case for a secondary battery includes a pan having a space for accommodating a battery main body and an opening. A first bonding portion extends along the edge of the pan. A second bonding portion extends along the edge of the cover portion for corresponding attachment to the first bonding portion when folded onto the pan. Thus, mass production of the case is possible and the bonding portion becomes firm when the first and second bonding portions are bonded together.