Method of manufacturing rechargeable battery pouch, apparatus for manufacturing the same, and rechargeable battery manufactured thereby
A method of manufacturing a rechargeable battery pouch having three sealed sides, an apparatus for manufacturing the same, and a rechargeable battery manufactured thereby in which a pouch film may be bent, and an uneven portion may then be formed in a bent portion by using a bending knife, thereby reducing a gap between a lower end of the pouch film and an electrode assembly when the electrode assembly is accommodated in the pouch film. In this manner, it is possible to reduce a size of a bat-ear shaped fold to increase a contact area between the battery pouch and a cooling plate, and improve a space efficiency of the rechargeable battery.
1. A method of manufacturing a rechargeable battery pouch, the method comprising:
forming a pouch by forming a space for accommodating an electrode assembly in a pouch film;
providing a bending die used to form a bent portion on the pouch film;
disposing the pouch film on top of the bending die;
bending the pouch film to form the bent portion by pushing down both sides of the pouch film along each side of the bending die while the pouch film is disposed on the top of the bending die;
after bending the pouch film to form the bent portion, forming an uneven portion in the bent portion by pressing a bending knife toward a center of the bent portion;
disposing the electrode assembly against the uneven portion of the pouch film, and folding opposing ends of the pouch film over the electrode assembly to form a space for accommodating the electrode assembly in the pouch film; and
sealing together at least the folded opposing ends of the pouch film.
2. The method of claim 1 , wherein the bending die includes an edge having a predetermined angle for the pouch film to be bent, and a recess is included in the edge of the bending die.
3. The method of claim 2 , wherein a protrusion corresponding to the recess of the bending die is formed at one end of the bending knife, and
when the bent portion of the pouch film is pressed by the protrusion of the bending knife in the forming of the uneven portion, the protrusion of the bending knife is accommodated in the recess of the bending die, thereby forming the uneven portion in the pouch film.
4. The method of claim 3 , wherein the bending die has two or more recesses, and the bending knife has two or more protrusions corresponding to the two or more recesses of the bending die.