Abstract: A battery state estimating apparatus according to an embodiment of the present disclosure includes a measuring unit configured to measure a charging current, and voltage and temperature of a battery in a constant current charging process and a constant voltage charging process of the battery; and a control unit configured to judge whether an abnormal behavior occurs in the battery according to a behavior of at least one of the charging current, the voltage of the battery and the temperature of the battery in at least one of the constant current charging process and the constant voltage charging process, and determine whether lithium precipitation occurs in the battery based on the judged abnormal behavior of the battery.

Abstract: A cylindrical secondary battery includes a jelly-roll electrode assembly wound by interposing a separator between sheet-shaped positive and negative electrodes, a battery case in which the electrode assembly is accommodated, a cap assembly coupled to an upper portion of the battery case, and a center pin inserted into a core of the electrode assembly and configured to elastically support the electrode assembly in a radial direction on an inner circumferential surface of the core. The center pin includes an elastic body having a length.

Abstract: An electrode assembly having a positive electrode; a negative electrode; and a separator interposed between the positive electrode and the negative electrode is provided. The positive electrode includes a positive electrode active material layer located on a positive electrode current collector, and the negative electrode includes a negative electrode active material layer located on a negative electrode current collector. A non-coated part is located at an edge of the negative electrode current collector. A disconnection preventing layer is located at the negative electrode current collector. The disconnection preventing layer extends from an external side of the non-coated part and is bent to overlap a portion of the non-coated part.