Abstract: A cylindrical secondary battery including a battery unit including a wound first electrode plate, separator, and second electrode plate, and first and second electrode tabs respectively protruding from the first and second electrode plates; a can for accommodating the battery unit; a cap assembly for sealing an opening of the can; and a first insulation plate in the can and on an upper portion of the battery unit, the first insulation plate being configured to prevent a short between the first electrode tab and the second electrode plate having different polarities, wherein the first insulation plate includes a linear small aperture through which the first electrode tab extends and a circular small aperture for injection of an electrolyte, and the linear and circular small apertures are disposed in a region equal to or less than 50% of the first insulation plate.

Abstract: An electrode assembly and a secondary battery having the same improve efficiency and stability of the secondary battery. The electrode assembly includes: a positive electrode plate having a positive electrode collector on which a positive electrode coating portion and a positive electrode non-coating portion are formed; a negative electrode plate having a negative electrode collector on which a negative electrode coating portion and a negative electrode non-coating portion are formed; a separator disposed between the positive electrode plate and the negative electrode plate; and an insulating member disposed on one side of the positive or negative electrode non-coating portion, and formed adjacent to at least one of the ends of the positive electrode coating portion and/or at least one of the end of the negative electrode coating portion. The electrode assembly at least prevents damage to a separator generated due to non-uniformity of the ends of the electrode coating portion.

Abstract: An electrode assembly and a secondary battery having the same improve efficiency and stability of the secondary battery. The electrode assembly includes: a positive electrode plate having a positive electrode collector on which a positive electrode coating portion and a positive electrode non-coating portion are formed; a negative electrode plate having a negative electrode collector on which a negative electrode coating portion and a negative electrode non-coating portion are formed; a separator disposed between the positive electrode plate and the negative electrode plate; and an insulating member disposed on one side of the positive or negative electrode non-coating portion, and formed adjacent to at least one of the ends of the positive electrode coating portion and/or at least one of the end of the negative electrode coating portion. The electrode assembly at least prevents damage to a separator generated due to non-uniformity of the ends of the electrode coating portion.

Abstract: An electrode assembly and a secondary battery having the same improve efficiency and stability of the secondary battery. The electrode assembly includes: a positive electrode plate having a positive electrode collector on which a positive electrode coating portion and a positive electrode non-coating portion are formed; a negative electrode plate having a negative electrode collector on which a negative electrode coating portion and a negative electrode non-coating portion are formed; a separator disposed between the positive electrode plate and the negative electrode plate; and an insulating member disposed on one side of the positive or negative electrode non-coating portion, and formed adjacent to at least one of the ends of the positive electrode coating portion and/or at least one of the end of the negative electrode coating portion. The electrode assembly at least prevents damage to a separator generated due to non-uniformity of the ends of the electrode coating portion.

Abstract: An electrode assembly comprising an electrode tab or an electrode plate substrate which has an identification mark formed thereon and a lithium rechargeable battery using the same are disclosed. This identification mark makes it possible to easily check the record of the manufacturing processes of the battery, including production equipment, production date, line operators, and production lines when a battery malfunctions. This identification mark may prevent a replica of the defective component from being manufactured.

Abstract: An electrode assembly comprising an electrode tab or an electrode plate substrate which has an identification mark formed thereon and a lithium rechargeable battery using the same are disclosed. This identification mark makes it possible to easily check the record of the manufacturing processes of the battery, including production equipment, production date, line operators, and production lines when a battery malfunctions. This identification mark may prevent a replica of the defective component from being manufactured.

Abstract: A can type secondary battery and a method of manufacturing a circuit board for the secondary battery that improves reliability by providing a consistent breakdown pressure of the circuit board used in the can type secondary battery. The can type secondary battery includes an electrode assembly, a can to house the electrode assembly and a cap assembly combined with the can. The cap assembly includes a circuit board, which includes fiber layers and is broken by a safety vent when an internal pressure of the can is increased. A woven direction of the fiber layers is inclined with respect to a length direction of the circuit board. Distribution of the breakdown pressure among the circuit boards is decreased, and thus the circuit boards are broken under a consistent pressure, thereby improving the reliability of the can type secondary battery.

Abstract: Disclosed is a cylindrical lithium secondary battery capable of improving the stability thereof against the external pressure, The cylindrical lithium secondary battery includes an electrode assembly and a core. The electrode assembly includes a first electrode sheet, a second electrode sheet and a separator interposed between the first and second electrode sheets, which are rolled together about an axis. The electrode assembly defines a space. The core has a tubular shape provided with a gap. The core includes at least one reinforcing structure extending in a direction extending along the axis. The core is inserted into the space of the electrode assembly. A housing receives the electrode assembly and core.

Abstract: A cylindrical secondary battery including a battery unit including a wound first electrode plate, separator, and second electrode plate, and first and second electrode tabs respectively protruding from the first and second electrode plates; a can for accommodating the battery unit; a cap assembly for sealing an opening of the can; and a first insulation plate in the can and on an upper portion of the battery unit, the first insulation plate being configured to prevent a short between the first electrode tab and the second electrode plate having different polarities, wherein the first insulation plate includes a linear small aperture through which the first electrode tab extends and a circular small aperture for injection of an electrolyte, and the linear and circular small apertures are disposed in a region equal to or less than 50% of the first insulation plate.

Abstract: A lithium rechargeable battery includes a current interrupt device in a cap assembly that includes a weakened central breakage portion that is designed to break and interrupt the current in the battery when the pressure inside the battery increases.

Abstract: An electrode plate of a rechargeable battery that is capable of preventing wastage of a base film and preventing an active material layer from being irregularly formed and a method for fabricating the same is disclosed. The electrode plate is fabricated by continuously coating the active material layer lengthwise along a surface of the base film and cutting the base film in a direction substantially perpendicular to a length of the base film or in a direction that forms a predetermined angle in relation to the length of the base film. The method includes forming an active material layer lengthwise on a base film except for on predetermined parts of both ends of the base film by continuously coating active materials, and forming an electrode plate by cutting the base film formed with the active material layer in a direction substantially perpendicular to the length of the base film using a cutter.

Abstract: An electrode plate of a rechargeable battery that is capable of preventing wastage of a base film and preventing an active material layer from being irregularly formed and a method for fabricating the same is disclosed. The electrode plate is fabricated by continuously coating the active material layer lengthwise along a surface of the base film and cutting the base film in a direction substantially perpendicular to a length of the base film or in a direction that forms a predetermined angle in relation to the length of the base film. The method includes forming an active material layer lengthwise on a base film except for on predetermined parts of both ends of the base film by continuously coating active materials, and forming an electrode plate by cutting the base film formed with the active material layer in a direction substantially perpendicular to the length of the base film using a cutter.

Abstract: An electrode plate of a rechargeable battery that is capable of preventing wastage of a base film and preventing an active material layer from being irregularly formed and a method for fabricating the same is disclosed. The electrode plate is fabricated by continuously coating the active material layer lengthwise along a surface of the base film and cutting the base film in a direction substantially perpendicular to a length of the base film or in a direction that forms a predetermined angle in relation to the length of the base film. The method includes forming an active material layer lengthwise on a base film except for on predetermined parts of both ends of the base film by continuously coating active materials, and forming an electrode plate by cutting the base film formed with the active material layer in a direction substantially perpendicular to the length of the base film using a cutter.

Abstract: A cylindrical lithium secondary battery includes a wound electrode assembly having a first electrode plate, a second electrode plate, and a separator interposed between the first electrode plate and the second electrode plate. A core member is substantially in a shape of a pipe and has a cut formed along a longitudinal direction thereof, the cut forming two edges. The core member is inserted into a central space of the electrode assembly and has a predetermined deformation direction when subjected to external pressure. The battery also includes a case with a space for accommodating the electrode assembly and an open upper portion, and a cap assembly fixed to the upper portion of the case to hermetically seal the upper portion of the case.

Abstract: A cylindrical lithium secondary battery includes an electrode assembly which has a first electrode plate, a second electrode plate, and a separator provided between the first electrode plate and the second electrode plate, is wound in a spiral shape, and has a central space at the center of winding; a core member which is inserted into the central space of the electrode assembly; a case having a space for containing the electrode assembly; and a cap assembly which is connected to an upper portion of the case so as to seal the case.

Abstract: An electrode assembly and a secondary battery having the same improve efficiency and stability of the secondary battery. The electrode assembly includes: a positive electrode plate having a positive electrode collector on which a positive electrode coating portion and a positive electrode non-coating portion are formed; a negative electrode plate having a negative electrode collector on which a negative electrode coating portion and a negative electrode non-coating portion are formed; a separator disposed between the positive electrode plate and the negative electrode plate; and an insulating member disposed on one side of the positive or negative electrode non-coating portion, and formed adjacent to at least one of the ends of the positive electrode coating portion and/or at least one of the end of the negative electrode coating portion. The electrode assembly at least prevents damage to a separator generated due to non-uniformity of the ends of the electrode coating portion.

Abstract: A can type secondary battery and a method of manufacturing a circuit board for the secondary battery that improves reliability by providing a consistent breakdown pressure of the circuit board used in the can type secondary battery. The can type secondary battery includes an electrode assembly, a can to house the electrode assembly and a cap assembly combined with the can. The cap assembly includes a circuit board, which includes fiber layers and is broken by a safety vent when an internal pressure of the can is increased. A woven direction of the fiber layers is inclined with respect to a length direction of the circuit board. Distribution of the breakdown pressure among the circuit boards is decreased, and thus the circuit boards are broken under a consistent pressure, thereby improving the reliability of the can type secondary battery.

Abstract: A jelly-roll type electrode assembly, a lithium secondary battery having the same, and a method for manufacturing the same are provided. The electrode assembly comprises a deformation prevention core which simplifies the manufacture of a lithium secondary battery and prevents deformation of the electrode assembly. The electrode assembly comprises positive and negative electrode plates and a separator wound around a deformation prevention core. A positive electrode active material is coated on the positive electrode plate and a negative electrode active material is coated on the negative electrode plate. The separator insulates the positive electrode plate from the negative electrode plate. The deformation prevention core is located near the center of the electrode assembly.