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.

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.

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.

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.

A cell of Li-ion battery comprises a plurality of anodes and cathodes of rectangular shape, each one having a current collector tab protruding from a side of the rectangular shape. Each cathode is wrapped in a separator sheet and the cathodes and anodes are stacked on each other. A Li-ion battery comprises a stack of cells and at least four bus bar posts, each bus bar post being positioned in front of one tab in order to create an electrical connection between the tab and the bus bar post. A method for disassembling the battery comprises—holding the anode bus bar posts, and simultaneously pulling the cathode bus bar posts in the direction of the cathode tab protrusions, pulling the anode bus bar posts in the direction of the anode tab protrusions, separating the cathodes from the separators, and separating electrodes from the bus bar posts.

Provided is a rectangular secondary battery with improved rigidity against vibrations and impacts. A rectangular secondary battery of the present invention includes: a flat-shaped electrode group; a current-collecting plate electrically connected to the electrode group; a battery case accommodating the current-collecting plate and the electrode group; a battery cover that closes an opening of the battery case; an electrode terminal penetrating through the battery cover, the electrode terminal being connected to the current-collecting plate via a connecting member; and a gasket that is inserted between the electrode terminal and the battery cover for insulating and sealing. An insulator is disposed between the current-collecting plate and the battery cover, the battery cover includes a battery cover side fixing part that fixes the insulator, and the insulator includes a current-collecting plate side fixing part that fixes the current-collecting plate.

A secondary battery includes an outer package member, an electrode terminal, and a battery device. The outer package member has a flat and columnar shape and includes a first bottom part and a second bottom part opposed to each other. The electrode terminal is supported by the first bottom part and is insulated from the first bottom part. The battery device is contained inside the outer package member and includes a first electrode and a second electrode. The first bottom part has a recess around the electrode terminal.

A secondary battery includes: a case having an accommodating space therein; an electrode assembly accommodated in the case and having an uncoated portion on one end thereof; a current collector plate electrically connected to the uncoated portion of the electrode assembly; a cap plate sealing the case; and an electrode terminal outside the cap plate and electrically connected to the current collector plate. The current collector plate has a hole through which the electrode terminal passes and a coupling protrusion protruding toward the electrode assembly along a periphery of the hole.

A secondary battery includes: a case having an accommodating space therein; an electrode assembly accommodated in the case and having an uncoated portion on one end thereof; a current collector plate electrically connected to the uncoated portion of the electrode assembly; a cap plate sealing the case; and an electrode terminal outside the cap plate and electrically connected to the current collector plate. The current collector plate has a hole through which the electrode terminal passes and a coupling protrusion protruding toward the electrode assembly along a periphery of the hole.

A battery cell, a method and system for manufacturing the battery cell, a battery, and a power consuming device are provided. The battery cell comprises: an electrode assembly comprising a first tab, wherein the first tab is arranged around a central axis of the electrode assembly; a housing configured to accommodate the electrode assembly, wherein the housing comprises a barrel and a cover connected to the barrel, the barrel is arranged around a periphery of the electrode assembly, the cover is provided with an electrode lead-out hole, the central axis extends in a first direction and passes through the electrode lead-out hole, the first tab comprises a first annular portion, and a projection of the first annular portion in the first direction does not overlap with a projection of the electrode lead-out hole in the first direction; and an electrode terminal comprising a columnar portion.