Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2000-08-14
2001-07-03
Maples, John S. (Department: 1745)
Metal working
Method of mechanical manufacture
Electrical device making
C029S412000
Reexamination Certificate
active
06254648
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a case for a secondary battery and a manufacturing method thereof, and more particularly, to a case for a secondary battery which seals a main body of a current-generating battery, and to a manufacturing method thereof.
2. Description of the Related Art
Secondary batteries usually include a battery main body for generating current formed by stacking an anode plate, a cathode plate and a separator. An electrode terminal is connected to the battery main body which functions as an electrical passage to the outside. The battery main body and a portion of the electrode terminal are coupled, forming a seal.
According to the conventional technology, the lithium secondary battery is manufactured after the battery main body is inserted in a case in a form of a pouch. However, due to the structure as above, mass production of the battery is not easy and furthermore a bonding surface which closes a receiving portion of the case where the battery is received is not stable.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a case for a secondary battery which can be manufactured through mass production and has an improved bonding surface.
It is another objective of the present invention to provide a method for manufacturing the case for a secondary battery
Accordingly, to achieve the first objective, there is provided a case for a secondary battery which comprises: a pan having a space for accommodating a battery main body and an opening at the upper side thereof; a first bonding portion extended along the edge of the pan; a cover portion extended from the upper portion of one side of the pan for closing the opening of the pan by being folded onto the pan; and a second bonding portion extended along the edge of the cover portion and correspondingly attached to the first bonding portion when folded onto the pan.
It is preferable in the present invention that the pan, the first bonding portion, the cover portion, and the second bonding portion are integrally formed.
It is also preferable in the present invention that the first bonding portion and the second bonding portion are attached to each other without deformation.
It is yet preferable in the present invention that an emboss is formed at corresponding portions of the first bonding portion and the second bonding portion and the embossed portions of the first bonding portion and the second bonding portion are attached to each other.
It is further preferable in the present invention that concave and convex portions are formed at corresponding portions of the first bonding portion and the second bonding portion along the edge thereof and the concave and convex portions of the first bonding portion and the second bonding portion are attached to each other.
According to another aspect of the present invention, there is provided a case for a secondary battery which comprises: a pan having a space for accommodating a battery main body and an opening at the upper side thereof; a first bonding portion extended along the edge of the pan; a cover portion formed separately from the pan for closing the opening of the pan; and a second bonding portion extended along the edge of the cover portion and correspondingly attached to the first bonding portion.
To achieve the second objective, there is provided a method for manufacturing a case for a secondary battery which comprises the steps of: sectioning a plate material for the case to form a pan and a cover portion on the plate material; molding the material to form the pan; and severing the material according to each section of the plate material preparing a case material in a plate state: setting a plurality of sections on the case material for forming a pan of a battery main body, a gas receiving portion disposed at a side surface of the pan of the battery main body, a path connecting between the pan of the battery main body and the gas receiving portion, and a cover portion covering the pan of the battery main body 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 the case material according to each section.
It is preferable in the present invention that the molding of the material is performed by a pressing process.
REFERENCES:
patent: 5832585 (1998-11-01), Takiar et al.
patent: 5906661 (1999-05-01), Lake
Noh Hyung-gon
Yun Jong-hoon
Leydig , Voit & Mayer, Ltd.
Maples John S.
Samsung SDI & Co., Ltd.
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