Abstract: Disclosed, as a particle for cathode active materials, is a novel one-body particle for cathode active materials, including a core of lithium transition metal oxide containing Ni and a surface-layer portion formed on at least a part of the core, wherein the surface-layer portion contains both Co and a structure-stabilizing element, the core is present as a non-aggregated primary particle, and the structure-stabilizing element has a bond dissociation energy (BDE) with oxygen (O) greater than a bond dissociation energy (BDE) of Co and oxygen (O).

Abstract: Disclosed is a cathode active material for lithium secondary batteries containing lithium transition metal composite oxide in the form of primary particles having a one-body structure, the cathode active material having a ratio (R/L) of a right area (R) to a left area (L) in a particle size distribution (PSD) graph of less than 1.1, based on a maximum point of a main peak in the particle size distribution (PSD) graph, in which an X-axis represents a particle size (?m) and a Y-axis represents a relative particle amount (%).

Abstract: The present invention relates to a current collector having improved adhesive strength, and is a structure including a metal foil and a primer coating layer formed on at least one surface of the metal foil, wherein the surface of the primer coating layer is a flat surface that is rolled so as to be evenly flat.

Abstract: Discussed is an apparatus for manufacturing an electrode for a secondary battery, an electrode for a secondary battery which is manufactured therethrough, and a secondary battery. The apparatus notches a portion of a non-coating portion of an electrode collector, which is not coated with an electrode active material, in an electrode sheet coated with the electrode active material on the electrode collector to manufacture an electrode tab. The apparatus includes a notching roll that rotates to notch the portion of the non-coating portion, wherein the notching roll includes: a notching cutter provided on a portion of the notching roll, which faces the non-coating portion to notch the electrode sheet; and a roll pad provided on a portion of the notching roll, which faces the electrode active material, the roll pad contacting the electrode sheet when the notching roll rotates to prevent the electrode sheet from being slipped.

Abstract: Disclosed herein is a pouch-shaped secondary battery comprising a pouched-shaped battery case, an electrode assembly having a structure in which a positive electrode, a separator, and a negative electrode are stacked, the electrode assembly having an electrode tab coupled to the positive electrode or the negative electrode and an electrode lead coupled to the electrode tab, the electrode assembly being received in the pouch-shaped battery case, and an electrode-tab-cutting device located in the pouch-shaped battery case, the electrode-tab-cutting device being configured to cut the electrode tab or the electrode lead using an elastic member that is configured to be actuated when the pressure in the pouch-shaped battery case reaches or exceeds a predetermined limit pressure.

Abstract: Disclosed herein is a pouch-shaped secondary battery comprising a pouch-shaped battery case, an electrode assembly having a positive electrode, a separator, and a negative electrode that are sequentially stacked, the electrode assembly being received in the pouch-shaped battery case, and a venting guidance device located in the pouch-shaped battery case, the venting guidance device being configured to form a through-hole for gas discharge in the pouch-shaped battery case using an elastic member, the elastic member being configured to be actuated when a pressure in the pouch-shaped battery case reaches or exceeds a predetermined limit pressure.

Abstract: A pouch-type secondary battery includes an electrode assembly having a structure in which a separator is interposed between a positive electrode and a negative electrode, and a battery case including a first recess portion configured to receive the electrode assembly and a second recess portion configured to receive a supplementary electrolytic solution, wherein the second recess portion is located at at least one side of the first recess portion, and a sealing line configured to prevent movement of the supplementary electrolytic solution received in the second recess portion is formed between the first recess portion and the second recess portion.

Abstract: A method of manufacturing a battery cell is provided. The battery cell has an electrode assembly with a plurality of unit cells that a cathode plate and an anode plate coupled to a separator. A separation sheet or a separator is interposed therebetween. The method includes applying an electrode active material a side of a current collector to manufacture a cathode plate and an anode plate and forming an electrode tab by notching the uncoated portion of the exterior periphery the current collector in the cathode plate and the anode plate where an electrode active material is not coated while forming an aperture. The aperture penetrates through an active material coating layer and the current collector in the coated portion. The method further includes coupling the cathode plate and the anode plate to a separator at a position to allow communication of the apertures to manufacture a unit cell.

Abstract: Disclosed herein is a pouch-shaped secondary battery comprising a pouch-shaped battery case, an electrode assembly having a positive electrode, a separator, and a negative electrode that are sequentially stacked, the electrode assembly being received in the pouch-shaped battery case, and a venting guidance device located in the pouch-shaped battery case, the venting guidance device being configured to form a through-hole for gas discharge in the pouch-shaped battery case using an elastic member, the elastic member being configured to be actuated when a pressure in the pouch-shaped battery case reaches or exceeds a predetermined limit pressure.

Abstract: Disclosed herein is a pouch-shaped secondary battery comprising a pouched-shaped battery case, an electrode assembly having a structure in which a positive electrode, a separator, and a negative electrode are stacked, the electrode assembly having an electrode tab coupled to the positive electrode or the negative electrode and an electrode lead coupled to the electrode tab, the electrode assembly being received in the pouch-shaped battery case, and an electrode-tab-cutting device located in the pouch-shaped battery case, the electrode-tab-cutting device being configured to cut the electrode tab or the electrode lead using an elastic member that is configured to be actuated when the pressure in the pouch-shaped battery case reaches or exceeds a predetermined limit pressure.

Abstract: A method of manufacturing a battery cell is provided. The battery cell has an electrode assembly with a plurality of unit cells that a cathode plate and an anode plate coupled to a separator. A separation sheet or a separator is interposed therebetween. The method includes applying an electrode active material a side of a current collector to manufacture a cathode plate and an anode plate and forming an electrode tab by notching the uncoated portion of the exterior periphery the current collector in the cathode plate and the anode plate where an electrode active material is not coated while forming an aperture. The aperture penetrates through an active material coating layer and the current collector in the coated portion. The method further includes coupling the cathode plate and the anode plate to a separator at a position to allow communication of the apertures to manufacture a unit cell.

Abstract: A connecting element for a secondary battery according to the present disclosure includes a metal plate having a recess groove, a soldering pattern having a lower melting point than the metal plate and formed within the recess groove, and an insulation layer formed on at least one surface among both surfaces of the metal plate, and covering an area where the soldering pattern is formed. According to the present disclosure, it is possible to interrupt an overcurrent quickly when the overcurrent occurs, and prevent secondary damage caused by a spark that may occur when the connecting element for the secondary battery is ruptured.

Abstract: A connecting element for a secondary battery according to the present disclosure includes a metal plate having a recess groove, a soldering pattern having a lower melting point than the metal plate and formed within the recess groove, and an insulation layer formed on at least one surface among both surfaces of the metal plate, and covering an area where the soldering pattern is formed. According to the present disclosure, it is possible to interrupt an overcurrent quickly when the overcurrent occurs, and prevent secondary damage caused by a spark that may occur when the connecting element for the secondary battery is ruptured.