Abstract: A power storage cell includes a cell case and an electrode assembly. The cell case accommodates the electrode assembly. The cell case includes a case main body and a cover. The cover includes a first electrode terminal, an insulating member, an inversion plate, a cover main body, and a second electrode terminal. The cover main body electrically connects the inversion plate and the second electrode terminal to each other. The insulating member electrically insulates the first electrode terminal and the cover main body from each other. The inversion plate has a first surface. The first electrode terminal has a second surface. A groove group is formed in at least one of the first surface and the second surface.

Abstract: An ultrasonic joining horn disclosed herein can generate ultrasonic vibration in a predetermined vibration direction and includes a base portion, a stand portion that rises from an upper surface of the base portion, and a pressure contact portion formed of a plurality of protrusions that protrude from an upper surface of the stand portion. Each of the protrusions is formed into a pyramid shape or a truncated pyramid shape, the protrusions are arrayed, and when viewed from top, at least a portion of a peripheral edge of a portion in which the protrusions are arrayed has a zigzag shape. The zigzag portion is formed along at least one of the vibration direction and a perpendicular direction to the vibration direction. The upper surface of the base portion has an exposed surface on which the stand portion is not formed.

Abstract: An ultrasonic joining horn disclosed herein can generate ultrasonic vibration in a predetermined vibration direction and includes a base portion, a stand portion that rises from an upper surface of the base portion, and a pressure contact portion formed of a plurality of protrusions that protrude from an upper surface of the stand portion. Each of the protrusions is formed into a pyramid shape or a truncated pyramid shape, the protrusions are arrayed, and when viewed from top, at least a portion of a peripheral edge of a portion in which the protrusions are arrayed has a zigzag shape. The zigzag portion is formed along at least one of the vibration direction and a perpendicular direction to the vibration direction. The upper surface of the base portion has an exposed surface on which the stand portion is not formed.

Abstract: An ultrasonic welding method includes welding workpieces by applying ultrasonic vibration to the workpieces, wherein in the welding, the workpieces are vibrated at an amplitude smaller than an amplitude of the ultrasonic vibration.

Abstract: An ultrasonic joining horn disclosed herein can generate ultrasonic vibration in a predetermined vibration direction and includes a base portion, a stand portion that rises from an upper surface of the base portion, and a pressure contact portion formed of a plurality of protrusions that protrude from an upper surface of the stand portion. Each of the protrusions is formed into a pyramid shape or a truncated pyramid shape, the protrusions are arrayed, and when viewed from top, at least a portion of a peripheral edge of a portion in which the protrusions are arrayed has a zigzag shape. The zigzag portion is formed along at least one of the vibration direction and a perpendicular direction to the vibration direction. The upper surface of the base portion has an exposed surface on which the stand portion is not formed.

Abstract: This disclosure provides a terminal component that can reduce thermal deterioration due to beam irradiation to a metal joining portion. A terminal component disclosed herein includes a first member formed of a metal and a plate-like second member formed of a metal, and a metal joining portion joined by metal joining is formed in a boundary surface where the first member and the second member are stacked. On a surface of the second member in an opposite side to the boundary surface, a raised portion raised from the surface is formed in a peripheral portion close to the metal joining portion.

Abstract: A horn disclosed herein is a horn that transmits ultrasonic vibration to workpiece to be joined and includes a base portion and a tip end portion that protrudes from the base portion and is pressed against the workpiece. At least a portion of the tip end portion is a frame-like raised portion formed into substantially a frame shape. The frame-like raised portion may be formed into a rectangular shape. As a portion of the tip end portion, an inner raised portion may be provided inside the frame-like raised portion.

Abstract: A terminal part with enhanced joint strength of a joint portion between different metals is provided. A terminal part disclosed here includes a first metal and a second metal. A joint interface between the first metal and the second metal includes a first layer disposed at the second metal and containing a first intermetallic compound and a second layer disposed closer to the first metal than the first layer and containing a second intermetallic compound. In the second layer, the second intermetallic compound has grown in a dendritic pattern, and the first metal is present in a gap of the dendritic second intermetallic compound.

Abstract: A terminal component disclosed here includes a first metal and a second metal on which the first metal is overlaid. A joint portion joined by metal diffusion is formed at an interface between the first metal and the second metal. The second metal includes an insulating portion subjected to an insulating process in a portion except for the joint portion.

Abstract: A terminal component disclosed herein includes a first metal and a second metal stacked on the first metal. On the first metal, nickel is plated at least on a boundary surface with the second metal. A joining portion joined by diffusion of the metals is formed in a portion of a boundary between the first metal and the second metal.