Battery cell for secondary battery and battery pack having the same

1. A battery cell for a secondary battery, the battery cell comprising:

a battery part including a plurality of first electrode plates and a plurality of second electrode plates alternately stacked, and a separator inserted between neighboring first electrode plate and second electrode plate,

wherein the first electrode plates are a positive electrode plate and the second electrode plates are a negative electrode plate, and an uppermost electrode plate layer and a lowest electrode plate layer are formed of a first electrode plate or a second electrode plate; and

a case having a battery part space where the battery part is received,

wherein the separator inserted between the neighboring first electrode plate and second electrode plate has an area larger than that of the neighboring first electrode plate and second electrode plate, and an edge portion of the separator protrudes from edges of the neighboring first electrode plate and second electrode plate and is bent to form a bent portion in the separator, and the case has a bending part formed conforming to the bent portion of the separator,

wherein the bent portion includes a first bent portion bent toward the lowest electrode plate layer, and a second bent portion bent toward the uppermost electrode plate layer; and

the bending part includes a first bending part conformed with the first bent portion, and a second bending part conformed with the second bent portion, and

wherein the first and second bending parts are symmetrical with respect to a line of symmetry extending along a central longitudinal axis of the case.

2. A battery pack for a secondary battery comprising the battery cell of claim 1 .