Abstract: A secondary battery includes an electrode assembly including an electrode tab with a buffer, a case to accommodate the electrode assembly, and an insulator between the electrode assembly and the case.

Abstract: A rechargeable lithium battery includes an electrode assembly including a positive electrode, a first separator, a negative electrode, and a second separator that are sequentially stacked. The first separator includes a first substrate including a first side facing the positive electrode and a second side facing the negative electrode. The second separator includes a second substrate including a third side facing the negative electrode and a fourth side facing the positive electrode. At least one of the first side to the fourth side includes an organic layer including an organic material, and at least one of the second side or the third side includes an inorganic layer including an inorganic material.

Abstract: A rechargeable lithium battery includes an electrode assembly including a positive electrode, a first separator, a negative electrode, and a second separator that are sequentially stacked. The first separator includes a first substrate including a first side facing the positive electrode and a second side facing the negative electrode. The second separator includes a second substrate including a third side facing the negative electrode and a fourth side facing the positive electrode. At least one of the first side to the fourth side includes an organic layer including an organic material, and at least one of the second side or the third side includes an inorganic layer including an inorganic material.

Abstract: An example embodiment is to provide a rechargeable battery capable of including a plurality of electrode assemblies in one pouch while reducing the overall size. According to an example embodiment, a rechargeable battery may include at least one pair of electrode assemblies and a pouch forming one pair of battery cells by accommodating the electrode assemblies and sealing the outside of each electrode assembly, wherein the pouch includes a folding portion formed by folding a sealing portion between the one pair of battery cells.