Abstract: The purpose of the present invention is to provide a rectangular secondary battery with higher capacity. The rectangular secondary battery includes: a flat wound electrode group having a foil lamination part where foil exposure parts are laminated on both sides in the winding axis direction; a battery case where a plurality of wound electrode groups are accommodated in parallel; current collector boards, joined to the foil lamination part inside the battery case; and external terminals connected to the current collector boards and exposed outside of the battery case. At least two of the wound electrode groups have joined side lamination parts and non-joined side lamination parts made by splitting the foil lamination part into two in the thickness direction. The joined side lamination parts are being bundled and are joined to the current collector boards.

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 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 secondary battery includes a battery can 1 and a battery lid that seals an opening of the battery can 1. In a space defined by the battery can 1 and the battery lid 3, a power generation element group 6 formed by winding a positive plate and a negative plate are disposed. The battery can is formed in a shallow, bottomed rectangular shape, in which a length of one side perpendicular to a bottom of the shallow bottomed rectangle is smaller than lengths of other two sides. In the opposite ends of the power generation element group 6, uncoated sections 6A and 6B where no active material mix is coated are exposed. The power generation element group 6 is disposed so that the uncoated sections 6A and 6B are positioned directly above the through holes 1B. The connection members electrically and mechanically connected to the uncoated sections 6A and 6B are included to provide electrical continuity with an outside of the battery through the through holes 1B.

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 plurality of projections for projection welding are formed respectively on the opposite sides of a connector. The electrode plate of the sealing member of one of two adjacent cells is bonded and connected by projection welding to a side of the connector by way of the projections, while the cell case of the other cell is bonded and connected by projection welding to the other side of the connector by way of the projections. In this way, a plurality of cells are connected in series.

Abstract: A connection plate in form of flat plate is welded to be connected to portion that are close to each other, i.e., a connection-electrode portion of one of two adjacent cells and a bottom of a cell case of the other cell, while being bridged between the connection-electrode portion and the bottom of the cell case, thereby forming an inexpensive connecting structure between cells, that reduces the electric resistance, by simple processes. A battery module having a solid structure impervious to vibration or shock is formed by accommodating cylindrical cells in cell-accommodating portions, each of which has a square shape seen from the front, of a holder case made of synthetic resin with their cell axes arranged in parallel, and by closing both sides of the holder case with cover members having radiation holes. Then, a battery pack is formed by attaching outer plates to a plurality of such battery modules that are arranged and integrating them.

Abstract: A plurality of projections (29, 30) for projection welding are formed respectively on the opposite sides of a connector (27). The electrode plate (22) of the sealing member (20) of one of two adjacent cells (Ba1) is bonded and connected by projection welding to a side of the connector (27) by way of the projections (29), while the cell case (19) of the other cell (Ba2) is bonded and connected by projection welding to the other side of the connector (27) by way of the projections (30). In this way, a plurality of cells are connected in series.

Abstract: A cylindrical storage battery comprises a spirally coiled electrode plate assembly which includes positive and negative electrode plates spirally wound with a separator interposed therebetween. Upper and lower current collectors are welded to the upper and lower ends of the electrode plate assembly. The electrode plate assembly and the current collectors are housed in a metal casing, and an upper end of the casing is closed by a sealing plate. The upper current collector and the sealing plate are electrically connected through a lead terminal which is securely and reliably connected to the sealing plate. The lead terminal has one end portion formed with a hole, and this hole is fitted on a projected portion formed on a lower surface of the sealing plate. Around the portion of the lead terminal surrounding the hole is formed a projection or projections which is/are welded to the lower surface of the sealing plate.

Abstract: A sealed lead acid battery having a thermostat or thermal protector as a protector of battery from heat is provided, which comprises a battery container comprised of cell chambers each containing a cell element. A terminal box is provided at the end of the battery container. The battery container is provided at the end thereof with the terminal box. The thermostat or thermal protector is mounted in the terminal box to be highly sensitive to heat, thus protecting the lead acid battery from heat. In the terminal box are inserted a pair of charge and discharge terminals and the thermostat or thermal protector, so that safe positioning of the thermostat or thermal protector and good heat conduction from the cell element to the thermostat or thermal protector are secured.