Abstract: An electrode assembly comprises: a negative electrode, a separator, and at least two or more positive electrodes which are stacked in the electrode assembly with the negative electrode and the separator, each of the positive electrodes including a positive electrode active material applied to a surface of a positive electrode collector, wherein the positive electrode active material contains nickel, cobalt, and manganese, and a first composition ratio of nickel, cobalt, and manganese in the positive electrode active material applied to a first one of the positive electrodes is different from a second composition ratio of nickel, cobalt, and manganese in the positive electrode active material applied to a second one of the positive electrodes. The first and second positive electrodes may be stacked to adequately improve thermal stability and capacity.

Abstract: A lithium secondary battery with improved lifetime characteristics, a driving method thereof, a battery module including the same, and a battery pack including the battery module, provides the lithium secondary battery having an operating voltage that is less than a plateau voltage of the lithium/nickel composite oxide, and thus has an advantage of being enable to prevent the lithium/nickel composite oxide from being transferred to a spinel-like structure, suppress the capacity degradation according to an increase in cycle, and improve a lifetime characteristic.

Abstract: A secondary battery includes a separator in an electrode assembly thereof that has a sealing part for individually sealing a positive electrode and a negative electrode and has a double sealing structure. The double sealing structure including a first sealing part and a second sealing part so that an accommodation part for accommodating a fire extinguishing agent is provided at an end part of the negative electrode. Further, the secondary battery includes a flame propagation prevention part disposed on an outer surface of the electrode assembly so that a flame generated during thermal runaway of the secondary battery can be blocked in a stage in which the electrode assembly is positioned inside the battery cell, and thus a longer flame propagation time can be induced.

Abstract: A method for predicting a lifespan of a battery cell of the present invention includes: virtually dividing a capacity of a battery cell, which is a measurement object for lifespan prediction, into two or more capacity parts, and measuring charge and discharge cycle data for each of the capacity parts; correcting the charge and discharge cycle data by reflecting storage degeneration a positive electrode active material; and predicting a lifespan of the battery cell, based on the corrected charge and discharge cycle data.

Abstract: The present invention relates to a method for manufacturing a degenerate cell and a method for evaluating a degenerate cell including the same. The method for manufacturing a degenerate cell includes: preparing a battery cell which has a structure where an electrode assembly, which is generated by lamination of a negative electrode, a positive electrode, and a separator, is accommodated in a battery case, and an electrode lead is drawn out to an outside of the battery case; and precipitating lithium metal on a predetermined region between the negative electrode and the separator by performing charge and discharge under predetermined temperature, pressure and charge and discharge pattern conditions.

Abstract: The present technology relates to a battery cell jig including film-type pressure sensors, and a method of measuring a swelling of a battery cell using the same. According to the present invention, by using film-type pressure sensors, the volume of the measuring apparatus can be reduced, and abnormal degeneration of the battery cell by the pressure difference for each location of the battery cell can be prevented.

Abstract: An electrode assembly includes a separator, which is doubly sealed in a radical unit and a unit stack part to prevent short circuit occurring by contact between a positive electrode and a negative electrode due to contraction of the separator. The electrode assembly includes a unit stack part having a stacked structure including a plurality of radical units and an outer sealing part formed outside the unit stack part. Each of the radical unit is formed by alternately stacking electrodes and separators and includes a first inner sealing part in which a plurality of separators vertically stacked on the electrodes are sealed to each other on a side surface of each of the electrodes, and the outer sealing part is formed by sealing the separators of the plurality of radical units to each other outside the first inner sealing part.

Abstract: The present disclosure relates to an apparatus and a method for manufacturing a battery cell, and more particularly, to an apparatus and a method for manufacturing a battery cell, wherein a pressing jig provided with a semi-elliptical pressing part presses the battery cell to remove air bubbles from the battery cell.

Abstract: An electrode assembly comprises: a negative electrode, a separator, and at least two or more positive electrodes which are stacked in the electrode assembly with the negative electrode and the separator, each of the positive electrodes including a positive electrode active material applied to a surface of a positive electrode collector, wherein the positive electrode active material contains nickel, cobalt, and manganese, and a first composition ratio of nickel, cobalt, and manganese in the positive electrode active material applied to a first one of the positive electrodes is different from a second composition ratio of nickel, cobalt, and manganese in the positive electrode active material applied to a second one of the positive electrodes. The first and second positive electrodes may be stacked to adequately improve thermal stability and capacity.

Abstract: The present disclosure relates to an apparatus and a method for manufacturing a battery cell, and more particularly, to an apparatus and a method for manufacturing a battery cell, wherein a pressing jig provided with a semi-elliptical pressing part presses the battery cell to remove air bubbles from the battery cell.

Abstract: The present disclosure relates to an apparatus and a method for manufacturing a battery cell, and more particularly, to an apparatus and a method for manufacturing a battery cell, wherein a pressing jig provided with a semi-elliptical pressing part presses the battery cell to remove air bubbles from the battery cell.

Abstract: A charge/discharge pressurizing device includes a first pressurizing jig configured to pressurize one surface of an electrode lead of a battery cell, a second pressurizing jig configured to pressurize an other surface of the electrode lead facing the one surface of the electrode lead, a guide configured to be disposed to be spaced apart from the one surface of the first pressurizing jig by a predetermined distance, and a first pressurizing jig controller configured to be connected to the first pressurizing jig and to move the first pressurizing jig toward the one surface of the electrode lead.

Abstract: A charge/discharge pressurizing device includes a first pressurizing jig configured to pressurize one surface of an electrode lead of a battery cell, a second pressurizing jig configured to pressurize an other surface of the electrode lead facing the one surface of the electrode lead, a guide configured to be disposed to be spaced apart from the one surface of the first pressurizing jig by a predetermined distance, and a first pressurizing jig controller configured to be connected to the first pressurizing jig and to move the first pressurizing jig toward the one surface of the electrode lead.

Abstract: Disclosed is an electrode assembly in which a plurality of electrode plates are stacked so that a separator is interposed between a positive electrode plate and a negative electrode plate, wherein each of the electrode plates includes an electrode tab protruding outwards at one side thereof for coupling with an electrode lead, wherein at least one electrode plate of the positive electrode plate and the negative electrode plate extends relatively longer than the separator at one end of the electrode plate where the electrode tab is located to form the electrode plate extension protruding out of the separator, and wherein the electrode plate extensions of the same polarity are coupled to each other.

Abstract: The present disclosure relates to an apparatus and a method for manufacturing a battery cell, and more particularly, to an apparatus and a method for manufacturing a battery cell, wherein a pressing jig provided with a semi-elliptical pressing part presses the battery cell to remove air bubbles from the battery cell.

Abstract: Disclosed is an electrode assembly in which a plurality of electrode plates are stacked so that a separator is interposed between a positive electrode plate and a negative electrode plate, wherein each of the electrode plates includes an electrode tab protruding outwards at one side thereof for coupling with an electrode lead, wherein at least one electrode plate of the positive electrode plate and the negative electrode plate extends relatively longer than the separator at one end of the electrode plate where the electrode tab is located to form the electrode plate extension protruding out of the separator, and wherein the electrode plate extensions of the same polarity are coupled to each other.

Abstract: Disclosed are a method and a device for correcting a track deviation by the deviation of a disc through a fine seek operation that operates a tracking actuator in a coarse seek stage of an optical disc drive wherein a track cross signal of the disc is detected in the optical pick up during the course seek operation and at the same time by using an optical encoder and a linear scale which are installed separately, a scale cross signal of the linear scale is detected and the actuator is driven by a signal resulting from comparing both the signals. At the stage of the travel of the optical pick up, the track deviation of the disk is corrected, and accordingly the relative speed between the light spot and the track at a seek direction becomes small to facilitate the control of the actuator and not to be necessary for lowering a speed of the VCM used in the coarse seek in order to lower the relative speed.