Abstract: A rectangular secondary battery includes a current breaking mechanism with improved rigidity against vibration and impact. The current breaking mechanism is interposed in the middle of a current path electrically connected between an external terminal and a wound electrode group to break the current path by the rise of battery internal pressure. The current breaking mechanism includes a connection electrode arranged inside a battery lid and electrically connected to the external terminal, and a conductive plate bonded to the connection electrode and deformed by the rise of the battery internal pressure. The connection electrode includes a tabular member having a through hole in communication with the outside of the battery opening on a planar portion. The conductive plate includes a dome-shaped diaphragm portion gradually reducing its diameter as shifting in an axial direction and a flange portion extending radially outward from an outer peripheral portion of the diaphragm portion.

Abstract: A square secondary battery includes a generating element having an electrode; a battery can holding the generating element; a battery lid that seals an opening of the battery can; an external terminal arranged on the battery lid; and a current collector connecting the electrode of the generating element to the external terminal. The external terminal has a bus bar joint to which a bus bar is connected and a current collector joint to which the current collector is connected, the bus bar joint and the current collector joint being integrally juxtaposed on the battery lid. The current collector joint has a cylindrical insertion part to be inserted into a through hole in the battery lid and also has a sealing part arranged at an outer periphery of the insertion part, the sealing part pressing down a sealing member.

Abstract: A square secondary battery suppresses welding failure from occurring by temporarily retaining and securing a sealing cover and enabling detection by a leakage test even when welding failure occurs. The square secondary battery has a case surface portion with an injection opening for injecting an electrolyte, a sealing cover disposed at a position opposite to the case surface portion and sealing the injection opening and having an outer edge welded to the case surface portion to seal the injection opening, and a pressure sensitive adhesive member interposed between the sealing cover and the case surface portion for securing the sealing cover to the case surface portion. A gas passage is provided between the case surface portion and the sealing cover for communicating a gap formed at a position outer to the pressure sensitive adhesive member with respect to a battery case and the injection opening in a ventilation manner.

Abstract: A wound electrode body is fabricated by laminating and winding positive and negative electrode sheets together with a separator therebetween for insulation. On both positive and negative electrode side ends of the wound electrode body, laminates of current-collecting foil layered portions of the electrode sheets are bent or folded f toward the outer peripheral side to be separated into two. The separated laminates and forked connector leaves are overlapped and clamped between an ultrasonic chip and an anvil. Then, they are welded. The forked connector leaves are arranged such that no opposing forked connector leaf is present in the direction of a line normal to the forked connector leaf, so that the anvil does not have to be cantilevered. This allows welding by using the ultrasonic chip and the anvil without interfering with the collector rs. As a result, the quality of welding is improved.

Abstract: A secondary battery includes improved insulation properties between an electrode group and a battery container against an external force can be improved without lowering the battery capacity. The secondary battery of the present invention has: a wound electrode group formed by winding electrodes in which mixture layers are formed on metal foils; a battery container for housing the wound electrode group; and an insulator interposed between the wound electrode group and the battery container. The insulator has a section interposed between the battery container and a mixture layer laminated region formed at the center of the wound electrode group in the winding axis direction, and a section interposed between the battery container and a pair of metal foil exposed portions formed on both sides of the wound electrode group in the winding axis direction, wherein the latter region is thicker than the former region.

Abstract: A safety valve is integrally formed in a battery lid together with a peripheral wall portion by press and the like. The safety valve is formed in contact with the peripheral wall portion, at the bottom portion of the depressed portion depressed from the upper surface of the base portion of the battery lid. The upper surface of the safety valve is located below the lower surface of the base portion. When pressing force parallel to the upper surface of the battery lid is exerted on the inner peripheral surface of the peripheral wall portion while the connection tube and the like is connected, the pressing force can be supported by the entire thickness (plate thickness) of the base portion.

Abstract: An electric cell comprises: a power generating element including electrodes; a cell container including a cell case for housing the power generating element and a cell cover for sealing an opening of the cell case; two external terminals disposed on the cell cover; and two collector electrodes for connecting the electrodes of the power generating element to the external terminals; wherein each of the external terminals includes: a connector connected to one of the collector electrodes within the cell container; a flat section located right above the connector and exposed to the outside of the cell container; and a bolting section located adjacent to the flat section and having an insertion hole, and wherein the connector, the flat section, and the bolting section are integrally formed. The electric cell allows connection of external terminals to busbars either by bolting or welding.

Abstract: A positive electrode sheet and a negative electrode sheet are laminated and wound around a shaft core 126 while being insulated by a separator. Spreading operation plates 90P and 90N are fitted to both ends of the shaft core 126 in a winding axis direction, and operation protrusions 91A to 92B of the spreading operation plates 90P and 90N protrude from both flat end surfaces of a wound body 120. The spreading operation plates 90P and 90N are spread, so that laminate parts of a positive electrode connection part 122A and a negative electrode connection part 124A are pushed and extended outward on the flat end surfaces of the wound body 120, and V-shaped openings 120V continuous with the innermost peripheries of the wound body 120 are formed. The laminate parts are welded to positive and negative electrode current collectors 115 and 116.

Abstract: A positive electrode sheet and a negative electrode sheet are laminated and wound around a shaft core 126 while being insulated by a separator. Spreading operation plates 90P and 90N are fitted to both ends of the shaft core 126 in a winding axis direction, and operation protrusions 91A to 92B of the spreading operation plates 90P and 90N protrude from both flat end surfaces of a wound body 120. The spreading operation plates 90P and 90N are spread, so that laminate parts of a positive electrode connection part 122A and a negative electrode connection part 124A are pushed and extended outward on the flat end surfaces of the wound body 120, and V-shaped openings 120V continuous with the innermost peripheries of the wound body 120 are formed. The laminate parts are welded to positive and negative electrode current collectors 115 and 116.

Abstract: A wound electrode body is fabricated by laminating and winding positive and negative electrode sheets together with a separator therebetween for insulation. On both positive and negative electrode side ends of the wound electrode body, laminates of current-collecting foil layered portions of the electrode sheets are bent or folded f toward the outer peripheral side to be separated into two. The separated laminates and forked connector leaves are overlapped and clamped between an ultrasonic chip and an anvil. Then, they are welded. The forked connector leaves are arranged such that no opposing forked connector leaf is present in the direction of a line normal to the forked connector leaf, so that the anvil does not have to be cantilevered. This allows welding by using the ultrasonic chip and the anvil without interfering with the collector rs. As a result, the quality of welding is improved.

Abstract: A lid 3 that closes the upper surface of the opening of a closed-bottom prismatic tubular battery can 1, an electrode body 2 accommodated in the battery can 1, a negative terminal 12 penetratively fastened to the lid 3, an insulating plate 11 placed on the lower surface side of the lid 3, a lead plate 17 placed on the lower surface side of the insulating plate 11, and a negative electrode current collector lead 7 led upwardly of the electrode body 2 are included. The upper end portion of the current collector lead 7 is welded to the lower surface of the lead plate 17 and bent in a position located rather closer to the front wall of the battery can 1. The insulating plate 11 has a lid side insulating portion 22 held between the lid 3 and the lead plate 17 and a front sidewall 25 that extends downwardly from the front end side of the lid side insulating portion 22.

Abstract: A lid 3 that closes the upper surface of the opening of a closed-bottom prismatic tubular battery can 1, an electrode body 2 accommodated in the battery can 1, a negative terminal 12 penetratively fastened to the lid 3, an insulating plate 11 placed on the lower surface side of the lid 3, a lead plate 17 placed on the lower surface side of the insulating plate 11, and a negative electrode current collector lead 7 led upwardly of the electrode body 2 are included. The upper end portion of the current collector lead 7 is welded to the lower surface of the lead plate 17 and bent in a position located rather closer to the front wall of the battery can 1. The insulating plate 11 has a lid side insulating portion 22 held between the lid 3 and the lead plate 17 and a front sidewall 25 that extends downwardly from the-front end side of the lid side insulating portion 22.

Abstract: A tape cartridge comprising a housing case which comprises an upper wall and a lower wall both having a pair of holes for receiving driving shafts and a covering plate which covers the holes on the upper wall, the upper and lower sides of which can be clearly identified so that misloading is prevented.

Abstract: In a tape cartridge having a magnetic shielding plate, there are provided one or more supporting or receiving ribs for supporting one or more portions of the rear face of the magnetic shielding plate, preferably at the left and right portions thereof, and one or more guide ribs corresponding to but away from the supporting ribs a distance slightly greater than the thickness of the magnetic shielding plate, such that the shielding plate can be inserted into the gap between the one or more supporting ribs and the one or more guide ribs. Moreover, there is provided one or more pressing ribs having a vertical straight wall at a root portion of the rear face of the guide ribs so that the magnetic shielding plate is pressedly inserted between the straight wall of the pressing ribs and the supporting ribs for securing the magnetic shielding plate.

Abstract: A partition wall and a pair of side ribs are disposed in the front portion of a tape cartridge with a gap substantially equal to a thickness of a magnetic shielding plate so as to support the magnetic shielding plate by the partition wall and the side ribs, so that the magnetic shielding plate can be placed in position correctly and easily, thereby assuring reliable positioning of a pad supporting plate.