A battery cell comprising: a case; an electrode assembly including a positive electrode, a negative electrode, and a separator, accommodated in the case; a venting guide member having a guide groove therein into which a sealing portion (112, 113) of the case is at least partially inserted, and pressing the case to delay opening of the case; the electrode assembly further comprising a positive electrode tab connected to the positive electrode and drawn out of the case in one direction; and a negative electrode tab connected to the negative electrode and drawn out of the case in a direction, different from the one direction of the positive electrode tab, wherein the sealing portion (112, 113) of the case comprises: a first sealing portion formed on a surface of the case from which a positive electrode tab is drawn out; and a second sealing portion formed on a surface of the case from which a negative electrode tab is drawn out, wherein a bonding force of the first sealing portion in a region facing the positive electrode tab is weaker than in a region not facing the positive electrode tab and a bonding force of the second sealing portion in a region facing the negative electrode tab is weaker than in a region not facing the negative electrode tab, or wherein a bonding force in a region of the first sealing portion in which the positive electrode tab is not present is weaker than in a region of the first sealing portion in which the positive electrode tab is present and a bonding force in a region of the second sealing portion in which the negative electrode tab is not present is weaker than in a region of the second sealing portion in which the negative electrode tab is present, and wherein the region of the first sealing portion having the relatively weaker bonding force and the region of the second sealing portion having the relatively weaker bonding force are pressed by the venting guide member. a case; an electrode assembly including a positive electrode, a negative electrode, and a separator, accommodated in the case; a venting guide member having a guide groove therein into which a sealing portion (112, 113) of the case is at least partially inserted, and pressing the case to delay opening of the case; the electrode assembly further comprising a positive electrode tab connected to the positive electrode and drawn out of the case in one direction; and a negative electrode tab connected to the negative electrode and drawn out of the case in a direction, different from the one direction of the positive electrode tab, wherein the sealing portion (112, 113) of the case comprises: a first sealing portion formed on a surface of the case from which a positive electrode tab is drawn out; and a second sealing portion formed on a surface of the case from which a negative electrode tab is drawn out, wherein a bonding force of the first sealing portion in a region facing the positive electrode tab is weaker than in a region not facing the positive electrode tab and a bonding force of the second sealing portion in a region facing the negative electrode tab is weaker than in a region not facing the negative electrode tab, or wherein a bonding force in a region of the first sealing portion in which the positive electrode tab is not present is weaker than in a region of the first sealing portion in which the positive electrode tab is present and a bonding force in a region of the second sealing portion in which the negative electrode tab is not present is weaker than in a region of the second sealing portion in which the negative electrode tab is present, and wherein the region of the first sealing portion having the relatively weaker bonding force and the region of the second sealing portion having the relatively weaker bonding force are pressed by the venting guide member. a first sealing portion formed on a surface of the case from which a positive electrode tab is drawn out; and a second sealing portion formed on a surface of the case from which a negative electrode tab is drawn out, wherein a bonding force of the first sealing portion in a region facing the positive electrode tab is weaker than in a region not facing the positive electrode tab and a bonding force of the second sealing portion in a region facing the negative electrode tab is weaker than in a region not facing the negative electrode tab, or wherein a bonding force in a region of the first sealing portion in which the positive electrode tab is not present is weaker than in a region of the first sealing portion in which the positive electrode tab is present and a bonding force in a region of the second sealing portion in which the negative electrode tab is not present is weaker than in a region of the second sealing portion in which the negative electrode tab is present, and wherein the region of the first sealing portion having the relatively weaker bonding force and the region of the second sealing portion having the relatively weaker bonding force are pressed by the venting guide member.