Battery cell and manufacturing method thereof
A battery cell according to one embodiment of the present disclosure includes an electrode assembly including a positive electrode, a negative electrode, and a separator; and a pouch case in which a recessed portion for housing the electrode assembly is formed, wherein the pouch case is bent on the basis of at least one edge line among the edges formed by the recessed portion.
1 . A method of manufacturing a battery cell comprising the steps of:
bending a pouch case a first 90 degrees about a bending line;
then seating the pouch case on a mold including a stepped portion and a recessed forming portion, and at least one edge line among edges of the forming portion forms a stepped line on the stepped portion, wherein the bending line is aligned with and adjacent to the stepped line;
then forming the pouch case to have a shape conformal to the forming portion, thereby forming a recessed portion of the pouch case; and
then performing a second bending of the pouch case along the bending line a further 90 degrees to bring opposing surfaces of the pouch case into contact with each other.
2 . The method according to claim 1 , further comprising, after the forming of the recessed portion of the pouch case, inserting the electrode assembly into the recessed portion of the pouch case.
3 . The method according to claim 1 , further comprising, after the performing of the second bending of the pouch case, sealing the opposing surfaces to one another.
4 . The method according to claim 1 , wherein, during the forming of the recessed portion of the pouch case, the recessed portion is formed so that the bending line becomes one edge of the recessed portion of the pouch case.
5 . The method according to claim 1 , wherein the stepped line is a vertex of a 90 degrees angle between a vertically extending surface of the stepped portion and a horizontally extending surface of the stepped portion.