Abstract: A battery module according to one embodiment of the present invention includes a plurality of unit batteries, each including a protective circuit for protecting the unit battery, and a battery management system electrically connected to the unit battery. Each unit battery further includes a molding part for covering the protective circuit, and a positive terminal and a negative terminal to be connected to each of the protective circuit, and which protrude outward from each molding part.

Abstract: A secondary battery with a maximized cycle-life having a multi-stage safety valve so as to lower the inner pressure of the battery in stages. The multi-stage safety valve is installed on a case and the secondary battery is equipped with an electrode assembly including both positive and negative electrodes and a separator interposed therebetween.

Abstract: The present invention relates to a rechargeable battery including an electrode assembly comprising a positive electrode, a negative electrode, and a separator interposed therebetween. The battery further comprises a case accommodating the electrode assembly and a plurality of positive electrode terminals and negative electrode terminals that are exposed outside of the case, connected to the case, and coupled to the electrode assembly.

Abstract: A catalyst for a fuel cell includes platinum. The catalyst has an oxide reduction potential (ORP) that is not less than 430 mV. The ORP is estimated by a cyclic voltammetry test using a saturation calomel electrode.

Abstract: The present invention provides a membrane-electrode assembly for a fuel cell and a fuel cell system comprising the same. The membrane-electrode assembly includes a catalyst layer formed on both sides of a polymer electrolyte membrane, a platinum (Pt)-metal alloy catalyst included in the catalyst layer, wherein the alloy catalyst shows a diffraction peak in a 110 plane at a degree of 2?=30-35 in the measurement of X-ray (CuK ?) diffraction. The alloy catalyst has an excellent stability due to the compact crystal lattice structure of the catalyst, and it incurs low production costs and has sensitive reactivity.

Abstract: The present invention provides a membrane-electrode assembly for a fuel cell, and a fuel cell system that includes the same. The membrane-electrode assembly includes catalytic layers that are coated on both sides of a polymer electrolyte membrane. The catalytic layers include an alloy catalyst made of platinum and transition metals, and the D-band vacancy of the 5d-band orbital of the platinum is in the range of 0.3 and 0.45. The catalyst has excellent mass activity which improves the function of the fuel cell.

Abstract: A charging method and device for a rechargeable battery to make more stable and faster full charging possible. One embodiment of a charging method for the rechargeable battery includes charging the battery by applying a constant current, and then charging the battery by applying a constant current pulse having uniform pulse width. The charging method further comprises charging the battery by applying or interrupting the constant current and then applying the dynamic constant current pulse based on a voltage across terminals of the battery.

Abstract: A lithium secondary battery and a method for manufacturing the lithium secondary battery includes the forming of an electrode assembly by interposing a separator between a positive electrode and a negative electrode, accommodating the electrode assembly into a battery case, injecting an electrolytic solution into the battery case, and forming the battery. The act of sealing the battery is by reducing the internal pressure of the battery to be maintained at a certain range of pressure for a certain period of time, is further provided after injecting an electrolytic solution or after forming the battery. The lithium second battery can prevent deformation of an external shape of a battery due to swelling under a high-temperature condition and can prevent deterioration in performance of a battery.

Abstract: Provided is a method of preparing a battery employing a high-temperature formation method, a room-temperature formation method after storage at a high temperature or a compressive formation method with application of external pressure. The problem of swelling often occurring at a high temperature and at room temperature can be notably improved while minimizing a recovery ratio of the standard capacity of the battery.