Abstract: A battery cell and a battery cell manufacturing method are disclosed. A battery cell includes one or more electrode assemblies each including a positive electrode and a negative electrode, a case in which the one or more electrode assemblies are housed, a cap cover configured to cover an opening of the case, an electrode tab connected to the one or more electrode assemblies, and a boss terminal guidable by the cap cover, passing through the cap cover, and coupled to the electrode tab.

Abstract: A secondary battery includes an electrode assembly including a first electrode plate and a second electrode plate, a case for accommodating the electrode assembly, and having one open side, a cap plate coupled to the case at the one open side, a first terminal and a second terminal electrically connected to the electrode assembly, and coupled to the cap plate, and a lower insulator at a lower portion of the electrode assembly, located between the electrode assembly and another side of the case that faces the cap plate in a longitudinal direction, and including an inclined part corresponding to a direction of the electrode assembly on at least one edge of an upper end of the lower insulator.

Abstract: A secondary battery includes an electrode assembly including a first tab and a second tab at opposite ends of the electrode assembly in a longitudinal direction, respectively; a case configured to accommodate the electrode assembly and in which a first opening and a second opening are defined at opposite ends of the case in the longitudinal direction, respectively; a first cap plate coupled to the first opening of the case and insulated from and penetrated by a first terminal that is electrically coupled to the first tab of the electrode assembly, the first cap plate including a second terminal electrically coupled to the second tab of the electrode assembly; and a second cap plate coupled to the second opening of the case and electrically coupled to the second tab of the electrode assembly.

Abstract: A secondary battery includes: an electrode assembly including a first electrode tab and a second electrode tab at a top portion; a first terminal electrically connected to the first electrode tab of the electrode assembly; a case accommodating the electrode assembly and a portion of the first terminal and including a safety vent at a bottom portion; a side retainer between a side of the case and a side of the electrode assembly; and a cap plate sealing a top opening of the case, and the side retainer includes a gas movement passage extending in a third direction, which is a longitudinal direction of the case.