Abstract: An embodiment of the present invention relates to a secondary battery, and the object of the present invention is to provide a secondary battery capable of improving the flatness of an electrode assembly and reducing internal resistance when the electrode assembly is rolled.

Abstract: An electrode assembly includes: a first electrode plate having a first electrode uncoated portion spaced apart from both ends in a longitudinal direction thereof, and a base tab on one surface of the first electrode uncoated portion; a second electrode plate having a second electrode uncoated portion spaced apart from both ends in a longitudinal direction thereof, and a base tab on one surface of the second electrode uncoated portion; a separator between the first electrode plate and the second electrode plate; a tab cover tape attached to the one surfaces of the first electrode uncoated portion and the second electrode uncoated portion; an uncoated portion cover tape attached to each of the other surfaces of the first electrode uncoated portion and the second electrode uncoated portion; and an insulating tape attached onto the second electrode plate at a position corresponding to the first electrode uncoated portion.

Abstract: A curved secondary battery and a method of manufacturing the same, the curved secondary battery including an electrode assembly having a curved shape; and a pouch that accommodates the electrode assembly, wherein the pouch includes a first encapsulation sheet on a curved first surface of the electrode assembly, the first encapsulation sheet having a portion with a same curvature as the first surface; a second encapsulation sheet on a curved second surface of the electrode assembly, the second encapsulation sheet having a portion with a same curvature as the second surface; and an attaching portion that has a planar shape, the attaching portion being formed when a first boundary portion of the first encapsulation sheet and a second boundary portion of the second encapsulation sheet are attached to each other.

Abstract: A method of manufacturing a curved secondary battery, the method including preparing a flat secondary battery such that the flat secondary battery includes an electrode assembly and a pouch accommodating the electrode assembly; primary shaping the secondary battery such that the primary shaping includes disposing the flat secondary battery in a first jig, and pressing the flat secondary battery to form a primarily-shaped secondary battery such that the primarily-shaped secondary battery has a first curvature radius; secondary shaping the secondary battery such that the secondary shaping includes disposing the primarily-shaped secondary battery in a second jig, and pressing the primarily-shaped secondary battery to form a secondarily-shaped secondary battery having a second curvature radius; and maintaining the secondarily-shaped secondary battery after forming thereof in the second jig for a predetermined time period.

Abstract: A secondary battery includes an electrode assembly; a first pouch including an internal space accommodating the electrode assembly; and a second pouch coupled to at least one part of the first pouch and thermally bonded to at least one part of the first pouch, the first pouch and the second pouch sealing the electrode assembly. The first pouch and the second pouch each includes a body portion contacting the electrode assembly, the body portion comprising a back side, a front side opposite the back side, and two side surfaces between the back side and the front side; and a pair of wing portions respectively protruding from the two side surfaces of the body portion. A width of each of the pair of wing portions varies along the longitudinal direction of the electrode assembly such that the width of a central part of each of the pair of wing portions is greater than the width of either end part of each of the pair of wing portions.

Abstract: A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate; a first lead and a second lead on one end of the first electrode plate and one end of the second electrode plate, respectively; and a first electrode tab and a second electrode tab connected to the first lead and the second lead, respectively, and the first electrode tab and the second electrode tab are integral with each other.

Abstract: A secondary battery and a manufacturing method thereof are disclosed. In one embodiment, the battery includes an electrode assembly and a case accommodating the electrode assembly. The electrode assembly may include i) a first electrode plate comprising a first collector and a first active material layer formed on at least one side of the first collector, ii) a second electrode plate comprising a second collector and a second active material layer formed on at least one side of the second collector and iii) a separator interposed between the first and second electrode plates. In one embodiment, a plurality of pores are formed only in part of the first and second collectors.

Abstract: A curved secondary battery and a method of manufacturing the same, the curved secondary battery including an electrode assembly having a curved shape; and a pouch that accommodates the electrode assembly, wherein the pouch includes a first encapsulation sheet on a curved first surface of the electrode assembly, the first encapsulation sheet having a portion with a same curvature as the first surface; a second encapsulation sheet on a curved second surface of the electrode assembly, the second encapsulation sheet having a portion with a same curvature as the second surface; and an attaching portion that has a planar shape, the attaching portion being formed when a first boundary portion of the first encapsulation sheet and a second boundary portion of the second encapsulation sheet are attached to each other.

Abstract: An ultrasonic welding device includes a horn coupled to an ultrasonic wave oscillator. The horn performs ultrasonic welding by respectively disposing a negative electrode tab and a positive electrode tab on a negative electrode lead and a positive electrode lead of a rechargeable battery while pressure is applied. The horn includes a negative electrode horn and a positive electrode horn that respectively press the negative electrode tab and the positive electrode tab. The negative and positive electrode horns are integrally provided in a body and have pressing patterns of different shapes.

Abstract: A secondary battery includes an electrode assembly; a first pouch including an internal space accommodating the electrode assembly; and a second pouch coupled to at least one part of the first pouch and thermally bonded to at least one part of the first pouch, the first pouch and the second pouch sealing the electrode assembly. The first pouch and the second pouch each includes a body portion contacting the electrode assembly, the body portion comprising a back side, a front side opposite the back side, and two side surfaces between the back side and the front side; and a pair of wing portions respectively protruding from the two side surfaces of the body portion. A width of each of the pair of wing portions varies along the longitudinal direction of the electrode assembly such that the width of a central part of each of the pair of wing portions is greater than the width of either end part of each of the pair of wing portions.

Abstract: A lithium battery including a positive electrode; a negative electrode including a negative active material layer including a first aqueous binder and a second aqueous binder, the first aqueous binder including a monomer unit; and a separator between the positive electrode and the negative electrode, the separator including a base material layer and a polymer layer formed on at least one surface of the base material layer, and the polymer layer including a non-aqueous binder including a monomer unit identical to the monomer unit of the first aqueous binder is disclosed.

Abstract: A rechargeable lithium battery including a negative electrode, the negative electrode including a silicon-based material and graphite; a positive electrode; and an electrolyte, wherein the negative electrode includes silicon in an amount of greater than 0 wt % and less than or equal to about 2 wt %, based on a total weight of the silicon-based material and the graphite, and the rechargeable lithium battery has a discharge cut-off voltage of greater than or equal to about 3.1 V.

Abstract: A method of manufacturing a curved secondary battery, the method including preparing a flat secondary battery such that the flat secondary battery includes an electrode assembly and a pouch accommodating the electrode assembly; primary shaping the secondary battery such that the primary shaping includes disposing the flat secondary battery in a first jig, and pressing the flat secondary battery to form a primarily-shaped secondary battery such that the primarily-shaped secondary battery has a first curvature radius; secondary shaping the secondary battery such that the secondary shaping includes disposing the primarily-shaped secondary battery in a second jig, and pressing the primarily-shaped secondary battery to form a secondarily-shaped secondary battery having a second curvature radius; and maintaining the secondarily-shaped secondary battery after forming thereof in the second jig for a predetermined time period.

Abstract: A rechargeable lithium battery includes a positive electrode, a negative electrode, a separator between the positive electrode and the negative electrode, the separator including a porous substrate and a coating layer on at least one side of the porous substrate, the coating layer including a fluorine-based polymer, a ceramic, or a combination thereof; and an electrolyte. The negative electrode includes a current collector, a negative active material layer on the current collector, the negative active material layer including a polyvinylidene fluoride (PVdF) latex particle and an aqueous binder, and a polymer layer on the negative active material layer, the polymer layer including a PVdF latex particle.

Abstract: A secondary battery and a manufacturing method thereof are disclosed. In one embodiment, the battery includes an electrode assembly and a case accommodating the electrode assembly. The electrode assembly may include i) a first electrode plate comprising a first collector and a first active material layer formed on at least one side of the first collector, ii) a second electrode plate comprising a second collector and a second active material layer formed on at least one side of the second collector and iii) a separator interposed between the first and second electrode plates. In one embodiment, a plurality of pores are formed only in part of the first and second collectors.

Abstract: A lithium battery including a positive electrode; a negative electrode including a negative active material layer including a first aqueous binder and a second aqueous binder, the first aqueous binder including a monomer unit; and a separator between the positive electrode and the negative electrode, the separator including a base material layer and a polymer layer formed on at least one surface of the base material layer, and the polymer layer including a non-aqueous binder including a monomer unit identical to the monomer unit of the first aqueous binder is disclosed.

Abstract: An unmanned aerial vehicle equipped with a spherical locking portion for landing on an unmanned ground vehicle is disclosed. The spherical locking portion can be the body of the unmanned aerial vehicle. Further, an unmanned ground vehicle for landing of an unmanned aerial vehicle, comprising a landing portion configured to have some of a spherical locking portion of the unmanned aerial vehicle inserted therein is disclosed.

Abstract: An electrode assembly for a secondary battery having a positive and negative electrode plates with a separator interposed therebetween. The positive and negative electrode plates have coated and uncoated portions. The length of the interconnection between the coated and uncoated portion of the positive electrode plate is greater than the length of the interconnection between the coated and uncoated portions of the negative electrode plate to reduce heat concentration occurring at the positive electrode plate. In one implementation, that relative lengths between the boundary intervals between the coated and uncoated portions of the positive and negative electrodes are determined using a ratio comprised of the product of the relative resistances and thicknesses.

Abstract: An unmanned aerial vehicle equipped with a spherical locking portion for landing on an unmanned ground vehicle is disclosed. The spherical locking portion can be the body of the unmanned aerial vehicle. Further, an unmanned ground vehicle for landing of an unmanned aerial vehicle, comprising a landing portion configured to have some of a spherical locking portion of the unmanned aerial vehicle inserted therein is disclosed.