Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed on an optical axis from an object side toward an image side. A distance from an object-side surface of the first lens to an imaging plane of an image sensor is TTL, an overall focal length of an optical system including the first to sixth lenses is F, and TTL/F?0.83. An optical axis distance between the second lens and the third lens is D23, an optical axis distance between the third lens and the fourth lens is D34, and 2.2<D23/D34<5.4.

Abstract: The secondary battery according to the present invention may comprise the separator pocket part having the accommodation groove in which the first electrode plate is accommodated and a radical unit provided as the second electrode plate disposed on one surface of the separator pocket part to secure the stacking property, safety, and insulation.

Abstract: The present invention relates to a secondary battery. The secondary battery comprises: an electrode assembly having a through-hole; and a battery case accommodating the electrode assembly and having a through-type opening into which the through-hole is inserted, wherein the battery case comprises: a lower case comprising an accommodation part accommodating the electrode assembly and a lower inner sealing part having the through-type opening into which the through-hole is inserted; and an upper case comprising a cover part coupled to an upper portion of the lower case to finish the accommodation part and an upper inner sealing part having a coupling hole to which a front end of the lower inner sealing part is coupled.

Abstract: The secondary battery according to the present invention may comprise the separator pocket part having the accommodation groove in which the first electrode plate is accommodated and a radical unit provided as the second electrode plate disposed on one surface of the separator pocket part to secure the stacking property, safety, and insulation.

Abstract: The secondary battery according to the present invention may comprise the separator pocket part having the accommodation groove in which the first electrode plate is accommodated and a radical unit provided as the second electrode plate disposed on one surface of the separator pocket part to secure the stacking property, safety, and insulation.

Abstract: Provided is an electrode assembly manufacturing method including a process of cutting a separator included in an electrode assembly to have a margin protruding from an electrode plate. The method includes a first process of manufacturing one type of basic unit sheets having a structure in which electrode materials and separator materials, which are the same in number, are alternately stacked, or two or more types of basic unit sheets having a structure in which electrode materials and separator materials, which are the same in number, are alternately stacked, and a second-A process of cutting a portion of a margin area of the separator materials, which are not covered with the electrode materials, such that the separator materials of the basic unit sheets protrude over a specific distance from edges of the electrode materials.

Abstract: The present invention relates to a secondary battery. The secondary battery comprises: an electrode assembly having a through-hole; and a battery case accommodating the electrode assembly and having a through-type opening into which the through-hole is inserted, wherein the battery case comprises: a lower case comprising an accommodation part accommodating the electrode assembly and a lower inner sealing part having the through-type opening into which the through-hole is inserted; and an upper case comprising a cover part coupled to an upper portion of the lower case to finish the accommodation part and an upper inner sealing part having a coupling hole to which a front end of the lower inner sealing part is coupled.

Abstract: The present invention relates to a secondary battery. The secondary battery comprises: an electrode assembly having a through-hole; and a battery case accommodating the electrode assembly and having a through-type opening into which the through-hole is inserted, wherein the battery case comprises: a lower case comprising an accommodation part accommodating the electrode assembly and a lower inner sealing part having the through-type opening into which the through-hole is inserted; and an upper case comprising a cover part coupled to an upper portion of the lower case to finish the accommodation part and an upper inner sealing part having a coupling hole to which a front end of the lower inner sealing part is coupled.

Abstract: The present invention relates to an electrode assembly, and more specifically to an electrode assembly for a polymer secondary battery cell, including a cell stack part defined by stacking at least one radical unit having a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are stacked in turn, wherein at least one of the first electrode and the second electrode has a size corresponding to 99.7% to 100% of a size of the first separator or the second separator and thus is aligned to be coincided with or close to an end of the first separator or the second separator.

Abstract: The present invention relates to a secondary battery. The secondary battery comprises: an electrode assembly having a through-hole; and a battery case accommodating the electrode assembly and having a through-type opening into which the through-hole is inserted, wherein the battery case comprises: a lower case comprising an accommodation part accommodating the electrode assembly and a lower inner sealing part having the through-type opening into which the through-hole is inserted; and an upper case comprising a cover part coupled to an upper portion of the lower case to finish the accommodation part and an upper inner sealing part having a coupling hole to which a front end of the lower inner sealing part is coupled.

Abstract: Provided is an electrode assembly manufacturing method including a radical unit manufacturing stage in which a radical unit having a four-layer structure is manufactured by sequentially stacking a first electrode, a first separator, a second electrode, and a second separator, and a radical unit stacking stage in which the radical unit as a unit is repeatedly stacked to manufacture an electrode assembly, and whenever a predetermined number of radical units are stacked, the radical units are adhered to each other by heating and pressing an outermost one of the radical units.

Abstract: Provided is an electrode assembly manufacturing method including a process of cutting a separator included in an electrode assembly to have a margin protruding from an electrode plate. The method includes a first process of manufacturing one type of basic unit sheets having a structure in which electrode materials and separator materials, which are the same in number, are alternately stacked, or two or more types of basic unit sheets having a structure in which electrode materials and separator materials, which are the same in number, are alternately stacked, and a second-A process of cutting a portion of a margin area of the separator materials, which are not covered with the electrode materials, such that the separator materials of the basic unit sheets protrude over a specific distance from edges of the electrode materials.

Abstract: Provided is an electrode assembly manufacturing method including a process of cutting a separator included in an electrode assembly to have a margin protruding from an electrode plate. The method includes a first process of manufacturing one type of basic unit sheets having a structure in which electrode materials and separator materials, which are the same in number, are alternately stacked, or two or more types of basic unit sheets having a structure in which electrode materials and separator materials, which are the same in number, are alternately stacked, and a second-A process of cutting a portion of a margin area of the separator materials, which are not covered with the electrode materials, such that the separator materials of the basic unit sheets protrude over a specific distance from edges of the electrode materials.

Abstract: Provided is a method of manufacturing an electrode assembly by using a magazine. The method includes manufacturing radical units in which electrodes and separators are alternately stacked (operation S10), loading and aligning the radical units in an aligning magazine for accommodating the radical units (operation S20), inspecting a dimension of the radical units aligned in operation S20 (operation S30), and transferring radical units considered to have a normal dimension in operation S30, to a stacking magazine to align and stack the radical units, thereby forming an electrode assembly (operation S40).

Abstract: The secondary battery according to the present invention may comprise the separator pocket part having the accommodation groove in which the first electrode plate is accommodated and a radical unit provided as the second electrode plate disposed on one surface of the separator pocket part to secure the stacking property, safety, and insulation.

Abstract: Provided are a method of preparing an electrode assembly suitable for preparing a secondary battery having a structure that may increase a degree of freedom in the design of a device in which the secondary battery is installed, and a method of preparing a secondary battery.

Abstract: An electrode assembly according to an embodiment of the present invention includes a first electrode plate having a fist electrode tab at an end of one side thereof, a second electrode plate having a second electrode tab, which is formed in a same direction as a longitudinal direction of the first electrode tab and is formed at a position not overlapping the first electrode tab, and a protrusion which is formed at a position overlapping the first electrode tab, and a separator insulating the first electrode plate and the second electrode plate. Therefore, the electrode assembly according to the embodiment of the present invention and the secondary battery including the same may improve the stability of the secondary battery by preventing lithium ion accumulation in a separator.

Abstract: Provided is a method of manufacturing an electrode assembly by using a magazine. The method includes manufacturing radical units in which electrodes and separators are alternately stacked (operation S10), loading and aligning the radical units in an aligning magazine for accommodating the radical units (operation S20), inspecting a dimension of the radical units aligned in operation S20 (operation S30), and transferring radical units considered to have a normal dimension in operation S30, to a stacking magazine to align and stack the radical units, thereby forming an electrode assembly (operation S40).

Abstract: Provided are a method of preparing an electrode assembly suitable for preparing a secondary battery having a structure that may increase a degree of freedom in the design of a device in which the secondary battery is installed, and a method of preparing a secondary battery.

Abstract: Provided is an electrode assembly manufacturing method including a radical unit manufacturing stage in which a radical unit having a four-layer structure is manufactured by sequentially stacking a first electrode, a first separator, a second electrode, and a second separator, and a radical unit stacking stage in which the radical unit as a unit is repeatedly stacked to manufacture an electrode assembly, and whenever a predetermined number of radical units are stacked, the radical units are adhered to each other by heating and pressing an outermost one of the radical units.