Abstract: Disclosed are a battery module of which positive and negative electrodes can be readily discriminated from each other in a short time and a manufacturing process can be simplified, and a battery module using the same. A rechargeable battery includes: an electrode assembly including positive and negative electrodes, and a separator interposed between the positive and negative electrodes; a casing having an opened top face to store the electrode assembly; a cap assembly installed in an upper portion of the casing; an upper connection cap which has a female member and is fixed to the cap assembly; and a lower connection cap which has a male member and is fixed to a lower portion of the casing. The female member may be clinched to the upper connection cap, and the male member may be clinched to the lower connection cap.

Abstract: A battery management system for managing a battery including a plurality of battery cells and a driving method are provided. The system includes a sensor, and a main control unit (MCU). The sensor senses a voltage and a current of the battery. The MCU receives the voltage and the current of the battery, measures an open circuit voltage (OCV) in key-on using the battery voltage, and estimates an initial SOC depending on the OCV in the key-on. The MCU divides the OCV into first and second OCV regions, and, when the OCV in the key-on is in the first OCV region, estimates the initial SOC using a linear equation.