Abstract: A method for manufacturing the electrode assembly includes: a first step of preparing a plurality of radical units, each of which is manufactured by alternately stacking an electrode and a separator; a second step of stacking the plurality of radical units to manufacture an electrode stack; and a third step of pressing an outer surface of the electrode stack to manufacture an electrode assembly on which a curved surface having a curvature radius is formed on the electrode stack, wherein, when the sum of bonding force remaining after the third step among bonding force between the electrode and the separator as bonding force generated before the third step is defined as F1, the sum of force by which the electrode and the separator are spread again so that shapes of the electrode and the separator return to shapes before the electrode stack is pressed in the third step is defined as R, and the sum of bonding force additionally generated between the electrode and the separator within the electrode assembly by the

Abstract: An electrode assembly including an electrode stack including a plurality of radical units including an electrode and a separator and having a structure in which the plurality of radical units are sequentially stacked, wherein at least a portion of a circumference of the electrode stack is surrounded by the separator, a curved surface having a curvature radius is formed on a top or bottom surface of the electrode stack, and the separator surrounding at least the portion of the circumference of the electrode stack surrounds the curved surface formed on the electrode stack to maintain a relative distance between the radical units adjacent to each other is provided. A method of forming the electrode assembly is also provided.

Abstract: The present invention relates to an electrode assembly in which a plurality of electrode stacks are stacked to improve product reliability when manufactured and a method for manufacturing the same. The present invention also relates to a method for manufacturing an electrode assembly and includes a preparation step of preparing a plurality of electrode stacks in which an electrode and a separator are alternately stacked, a stacking step of stacking the plurality of electrode stacks on each other, a packaging step of wrapping and packaging a circumferential potion of the plurality of stacked electrode stacks using a separator member, and a fixing step of heating and pressing the separator member to fix the plurality of stacked electrode stacks.

Abstract: A method for manufacturing the electrode assembly includes: a first step of preparing a plurality of radical units, each of which is manufactured by alternately stacking an electrode and a separator; a second step of stacking the plurality of radical units to manufacture an electrode stack; and a third step of pressing an outer surface of the electrode stack to manufacture an electrode assembly on which a curved surface having a curvature radius is formed on the electrode stack, wherein, when the sum of bonding force remaining after the third step among bonding force between the electrode and the separator as bonding force generated before the third step is defined as Fl, the sum of force by which the electrode and the separator are spread again so that shapes of the electrode and the separator return to shapes before the electrode stack is pressed in the third step is defined as R, and the sum of bonding force additionally generated between the electrode and the separator within the electrode assembly by the

Abstract: Disclosed are an electrode assembly and a method for manufacturing the electrode assembly. According to the present invention, the electrode assembly may be manufactured in consideration of deformation of the electrode assembly and a secondary battery due to a swelling phenomenon to improve assemblability and storage ability of the secondary battery having a curved surface with respect to electronic devices. According to an aspect of the present invention for achieving the above effects, provided is an electrode assembly having a curved surface, wherein a curvature radius (Re) of each of ends of the curved surface is less than a curvature radius (Rc) of a central portion of the curved surface.

Abstract: A leveling apparatus used in a cutting process after forming process of a pouch-type secondary battery, and the leveling apparatus includes: a roller assembly having pairs of upper rollers and lower rollers arranged in at least two rows for rolling in contact with upper and lower surfaces adjacent to both rim edges of the pouch-type secondary battery; and a support frame supporting the roller assembly, wherein the roller assembly applies rolling with respect to the upper and lower surfaces adjacent to both rim edges of the pouch-type secondary battery to thereby remove stress.

Abstract: An electrode assembly including an electrode stack including a plurality of radical units including an electrode and a separator and having a structure in which the plurality of radical units are sequentially stacked, wherein at least a portion of a circumference of the electrode stack is surrounded by the separator, a curved surface having a curvature radius is formed on a top or bottom surface of the electrode stack, and the separator surrounding at least the portion of the circumference of the electrode stack surrounds the curved surface formed on the electrode stack to maintain a relative distance between the radical units adjacent to each other is provided. A method of forming the electrode assembly is also provided.

Abstract: The present invention relates to an electrode assembly in which a plurality of electrode stacks are stacked to improve product reliability when manufactured and a method for manufacturing the same. The present invention also relates to a method for manufacturing an electrode assembly, and the method includes a preparation step of preparing a plurality of electrode stacks in which an electrode and a separator are alternately stacked, a stacking step of stacking the plurality of electrode stacks on each other, a packaging step of wrapping and packaging a circumferential potion of the plurality of stacked electrode stacks using a separator member, and a fixing step of heating and pressing the separator member to fix the plurality of stacked electrode stacks.

Abstract: Disclosed are an electrode assembly and a method for manufacturing the electrode assembly. According to the present invention, the electrode assembly may be manufactured in consideration of deformation of the electrode assembly and a secondary battery due to a swelling phenomenon to improve assemblability and storage ability of the secondary battery having a curved surface with respect to electronic devices. According to an aspect of the present invention for achieving the above effects, provided is an electrode assembly having a curved surface, wherein a curvature radius (Re) of each of ends of the curved surface is less than a curvature radius (Re) of a central portion of the curved surface.

Abstract: Disclosed are a method for manufacturing an electrode assembly and a pressing device for the pressing electrode assembly. According to the present invention, the electrode assembly on which a curved surface having a curvature radius, which conforms to a curvature radius that is originally intended to be formed, is formed may be manufactured. Also, the electrode assembly on which a curved surface having a uniform curvature radius is formed by reducing or eliminating a difference between a curvature radius at a central portion of the electrode assembly and a curvature radius at each of both ends of the electrode assembly may be manufactured.

Abstract: A leveling apparatus used in a cutting process after forming process of a pouch-type secondary battery, and the leveling apparatus includes: a roller assembly having pairs of upper rollers and lower rollers arranged in at least two rows for rolling in contact with upper and lower surfaces adjacent to both rim edges of the pouch-type secondary battery; and a support frame supporting the roller assembly, wherein the roller assembly applies rolling with respect to the upper and lower surfaces adjacent to both rim edges of the pouch-type secondary battery to thereby remove stress.

Abstract: A method of welding a noble metal tip of a spark plug to an electrode is provided. In the method of welding, in a waveform of a power of a laser beam according to a time of the laser welding, a power of a central portion thereof is smaller than those of both end portions thereof. In addition, the waveform of the power of the laser beam according to a time of the laser welding is a trapezoidal waveform which includes: a rising portion in which the power of the laser beam is gradually increased; a power maintaining portion in which the power of the laser beam after the rising portion is maintained uniform; and a falling portion in which the power of the laser beam after the power maintaining portion is gradually decreased.

Abstract: A method of welding a noble metal tip of a spark plug to an electrode is provided. In the method of welding, in a waveform of a power of a laser beam according to a time of the laser welding, a power of a central portion thereof is smaller than those of both end portions thereof. In addition, the waveform of the power of the laser beam according to a time of the laser welding is a trapezoidal waveform which includes: a rising portion in which the power of the laser beam is gradually increased; a power maintaining portion in which the power of the laser beam after the rising portion is maintained uniform; and a falling portion in which the power of the laser beam after the power maintaining portion is gradually decreased.