Abstract: A battery cell includes: an electrode assembly including a first electrode and a second electrode with a separator interposed therebetween, and the first electrode, second electrode and separator are wound around a winding axis, wherein the first electrode includes a first uncoated portion, which is not coated with an active material layer; a battery housing having an opening and that accommodates the electrode assembly through the opening; and a current collector including a support portion, a tab coupling portion, and a housing coupling portion. A fracture portion is provided at a boundary between the support portion and the tab coupling portion.

Abstract: A separator, including a porous polymer substrate; and a porous coating layer on at least one surface of the porous polymer substrate. The porous coating layer includes a binder polymer and inorganic particles. The separator has two ends and includes an insulation coating layer at each of the two ends in a transverse direction on outermost sides of the separator. The insulation coating layer includes a filler and a binder. The insulation coating layer has a porous structure.

Abstract: A welding device includes a welding rod configured to be inserted into a winding center hole provided at a winding center of an electrode assembly inserted into a battery can to weld an electrode tab of the electrode assembly or an electric connection component coupled with the electrode tab to a bottom surface of the battery can. The welding rod includes a center rod located at a center of the welding rod; and an exterior cover configured to cover an outer circumference of the center rod. The exterior cover is configured to be movable in a first direction away from the center rod and in a second direction toward the center rod.

Abstract: An electrode assembly is made by stacking and winding a first electrode, a separator, and a second electrode, in which the first electrode includes a current collector, and an electrode active material layer provided on the current collector, in which an edge portion of the current collector provided at one end of a winding axis of the electrode assembly includes a non-coated portion on which no electrode active material layer is provided, and in which a non-coated portion of the first electrode is bent one or more times in a direction from a winding center of an electrode assembly toward an outer periphery of the electrode assembly.

Abstract: An electrode assembly having a first electrode, a second electrode, and a separator positioned between the first electrode and the second electrode. The first electrode, the second electrode, and the separator are together wound about an axis in a winding direction resulting in a plurality of winding turns. Each of the first electrode and the second electrode has a first side and a second side opposite the first side in the direction of the axis, as well as a first, electrode active material portion, coated with an electrode active material, extending from the second side in the direction of the first side, and a second, uncoated portion extending from the first side in the direction of the second side to the active material of the first portion.

Abstract: The present invention relates to a method for recovering light olefins, which can achieve an increase in propylene production and a reduction in the basic unit of a process by feeding steam into five serially connected dehydrogenation reactors, and can diversify the product of a propane dehydrogenation reaction process from a propylene single product into propylene and ethylene by separately collecting ethane and ethylene, i.e., by-products of the propylene production process, and converting the ethane into ethylene, thereby improving the economic efficiency of the process and selectivity.

Abstract: The present invention relates to a method for recovering light olefins, which can achieve an increase in propylene production and a reduction in the basic unit of a process by feeding steam into five serially connected dehydrogenation reactors, and can diversify the product of a propane dehydrogenation reaction process from a propylene single product into propylene and ethylene by separately collecting ethane and ethylene, i.e., by-products of the propylene production process, and converting the ethane into ethylene, thereby improving the economic efficiency of the process and selectivity.

Abstract: An apparatus for opening/closing a process chamber door of an oven for manufacturing a semiconductor device includes a boss formed at one side of an opening of the process chamber, a shaft which passes freely through the center of the boss, bearings attached to the process chamber and rotatably supporting the ends of the shaft, a driver for rotating the shaft in opposite directions over a predetermined angle, and a door that seals the opening, one side of the door being attached to the shaft so as to be moved when the shaft rotates. Alternatively, the present invention provides a pair of bearings disposed beside one side of an opening of the process chamber, a shaft whose ends are rotatably supported by the bearings, a bracket having one end fixed to the shaft, and another end fixed to the door. A driver also rotates the shaft over a predetermined angle that opens and closes the door.

Abstract: An apparatus for opening/closing a process chamber door of an oven for manufacturing a semiconductor device includes a boss formed at one side of an opening of the process chamber, a shaft which passes freely through the center of the boss, bearings attached to the process chamber and rotatably supporting the ends of the shaft, a driver for rotating the shaft in opposite directions over a predetermined angle, and a door that seals the opening, one side of the door being attached to the shaft so as to be moved when the shaft rotates. Alternatively, the present invention provides a pair of bearings disposed beside one side of an opening of the process chamber, a shaft whose ends are rotatably supported by the bearings, a bracket having one end fixed to the shaft, and another end fixed to the door. A driver also rotates the shaft over a predetermined angle that opens and closes the door.

Abstract: An X-Y table of a microscope includes an a X-axis moving plate, an object holder mounted on an upper surface of the X-axis moving plate, a Y-axis moving plate to which the X-axis moving plate is slidingly coupled for movement in the X direction, a fixed plate to which the Y-axis moving plate is slidingly coupled for movement in the Y direction, an X-axis driving system which uses a belt for moving the X-axis moving plate in the X direction, and Y-axis driving system which also uses a belt for moving the Y-axis moving plate in the Y direction. The X-axis moving plate and the Y-axis moving plate serve as the stage of the microscope. In operation, when it is desired to move the X- and Y-moving plates rapidly to generally position the object under the microscope, the belts of the X- and Y-driving systems are disengaged from drive elements associated therewith.