Abstract: A power storage device includes a first electrode having a strip first current collector and a first active material layer carried on the first current collector, a second electrode having a strip second current collector and a second active material layer carried on the second current collector, and a separator interposed between the first electrode and the second electrode. The first electrode, the second electrode, and the separator form a columnar wound body. The first current collector has a plurality of first tabs electrically connected to one end along the longitudinal direction of the first current collector and extending radially inward of the wound body. The first tab has a proximal end portion connected to the first current collector, and a first wide portion wider than the proximal end portion. The plurality of first tabs are overlapped and welded to each other at their first wide portions.

Abstract: A power storage device includes a first electrode having a first current collector, a second electrode having a second current collector, and a separator, which form a columnar wound body. The power storage device includes a cylinder covering an outer periphery of the columnar wound body and having a first opening, a sealing body sealing the first opening, and at least one first tab, its one end connected to the first current collector and the other end connected to the sealing body. The sealing body has a first member including a first face facing away from the columnar wound body, and a second member including a second face facing the columnar wound body. The other end of the first tab is welded to the first face of the first member to form a first welding portion that is positioned between the first face and the second face.

Abstract: A power storage device has a columnar wound body in which a first and second electrode are placed on top of another with a separator interposed therebetween. The first electrode has a first portion, a second portion, and a first connection portion that connects the first and second portion, and the first and second portion face each other. The first connection portion is provided in a band region of the first current collector along the winding direction of the wound body, as a first exposed portion not having the first active material layer and exposing the first current collector. The first and second portions are portions each having the first active material layer at both sides of the first connection portion. The second electrode is sandwiched by the first portion and the second portion with the separator interposed therebetween, and wound along the winding direction to form the wound body.

Abstract: A power storage device includes a first electrode having an elongated sheet first current collector, and a first active material layer carried on the first current collector, an elongated sheet second electrode, a separator interposed between the first electrode and the second electrode, a non-aqueous electrolyte, and a first current collecting portion electrically connected to the first current collector, wherein the first electrode, the second electrode, and the separator form a columnar wound body, one end portion along a longitudinal direction of the first current collector is a first exposed portion not having the first active material layer and projected from one end face of the wound body, the first current collecting portion has a porous metal portion, and one or more projected portions that are pressed into the porous metal portion, and the porous metal portion fills the gap of the first exposed portion.

Abstract: An electrical storage module includes: a plurality of electrical storage devices; and a bus bar that connects electrode terminals of the electrical storage devices to each other, in which the electrical storage device includes an outer covering can in which an opening is formed, and a plate-shaped sealing body that is provided with the electrode terminal and is inserted into the opening of the outer covering can, the electrode terminal has a container that includes a through-hole or a recess that is formed in a direction substantially orthogonal to a direction in which the sealing body is inserted into the outer covering can, and the bus bar includes a press-fitting portion that is press-fitted into the container.

Abstract: A power storage module includes an array including power storage devices each having first and second surfaces opposite to each other in a first direction, a first restraint member facing the first surface of each power storage device, and a second restraint member facing the second surface of each power storage device. Dimensions of the power storage devices in a second direction perpendicular to the first direction are larger than respective dimensions of the power storage devices. The power storage devices are arranged in a third direction perpendicular to the first and second directions. The first restraint member extends in the third direction and restrains the array in the third direction. The second restraint member extends in the third direction and restrains the array in the third direction. At least one of the first and second restraint members has a hole therein. The hole is a recess falling in the first direction or a through-hole passing through the restraint member in the first direction.

Abstract: A secondary battery has an electrode body, a sealing plate sealing an opening of a battery case, current collector tabs provided respectively on a positive and a negative electrode plate, current collector terminals disposed inside the sealing plate and connected respectively to the positive and the negative electrode plate with the respective current collector tabs interposed therebetween, and external terminals disposed outside the sealing plate and connected to the respective current collector terminals. The electrode body is accommodated in the battery case with the electrode current collector tabs being bent in a space inside the sealing plate, and each of the current collector tabs has a joined portion ultrasonically joined to the corresponding current collector terminal and a bend portion provided at a position away from the joined portion and on the electrode body side and serving as a starting portion at which the current collector tab is bent.

Abstract: A rectangular battery with a plurality of stacked positive electrode plates. Each positive electrode plate includes a positive electrode active material arrangement portion and a positive electrode collector tab, the positive electrode active material arrangement portion including a plate-like core body and a positive electrode active material containing layer that is provided at the core body, the collector tab being integrated with the core body and protruding from the positive electrode active material arrangement portion. Each positive electrode collector tab includes a curved portion that is positioned between the corresponding positive electrode active material arrangement portion and the positive electrode collector terminal in a Z direction (a region in the Z direction indicated by B), and has at least a part thereof curved.

Abstract: An electric power storage device includes a case body with an opening, the opening formed at an upper portion of the case body; an electrode body housed in the case body; a tab portion; and a current collecting terminal. The tab portion protrudes from part of the electrode body toward the opening of the case body. The tab portion has a side surface not facing the electrode body. The current collecting terminal is welded to the side surface of the tab portion.

Abstract: A secondary battery includes: an electrode body including an electrode main body, a collector foil protrusion section, and a collector foil connection portion; a first collector terminal including a first extension part that is welded to the collector foil connection portion; and a second collector terminal that is a member separate from the first collector terminal and includes a second extension part welded to the collector foil connection portion. The first extension part and the second extension part are located on the opposite sides of the collector foil connection portion. The secondary battery includes a welded joint at which both the first extension part and the second extension part are welded to the collector foil connection portion such that the first extension part, the second extension part, and the collector foil connection portion are united. The first collector terminal and the second collector terminal are united through the welded joint.

Abstract: Provided is a nonaqueous electrolyte secondary battery that can be produced with high yield, through suppression of breakage of electrode collector portions during production and through suppression of damage to an electrode body during welding. The nonaqueous electrolyte secondary battery disclosed herein is provided with: an electrode body in which a plurality of electrodes are stacked; and a nonaqueous electrolyte. Each electrode has a collector and an active material layer formed on the collector. Each electrode has a collector portion being an active material layer non-forming portion. The collector portions of the electrodes are grouped and are clamped, in the stacking direction of the electrode body, by two or more members of an electrode collector terminal that is made up of the members. The collector portions of the electrodes and the members that clamp the collector portions are welded.

Abstract: A secondary cell manufacturing method includes placing a current collector terminal on a plurality of laminated current collector foils from a lamination direction of the current collector foils. The current collector terminal has a first end portion, and a second end portion forming a cutout with the first end portion. The second end portion includes a base part, and a thin-walled part having a smaller thickness than the base part. The secondary cell manufacturing method includes welding the plurality of current collector foils to the current collector terminal by scanning the plurality of current collector foils disposed in the cutout with a laser beam along the first extension direction toward the second end portion while irradiating the plurality of current collector foils with the laser beam.

Abstract: An electrical storage device includes a polar plate and a collector plate. The polar plate includes a mixture layer and a collector. The collector includes an exposed portion. The exposed portion is exposed from the mixture layer in one end of the polar plate in a width direction. The collector plate includes a facing portion, a projection portion, and a corner portion. The facing portion is opposed to a tip end surface of the exposed portion. The projection portion extends from the facing portion so as to project toward the exposed portion relative to the facing portion. The corner portion is placed in a boundary between the facing portion and the projection portion. The collector plate is welded to the exposed portion in at least part of the corner portion.

Abstract: Provided is a nonaqueous electrolyte secondary battery that can be produced with high yield, through suppression of breakage of electrode collector portions during production and through suppression of damage to an electrode body during welding. The nonaqueous electrolyte secondary battery disclosed herein is provided with: an electrode body in which a plurality of electrodes are stacked; and a nonaqueous electrolyte. Each electrode has a collector and an active material layer formed on the collector. Each electrode has a collector portion being an active material layer non-forming portion. The collector portions of the electrodes are grouped and are clamped, in the stacking direction of the electrode body, by two or more members of an electrode collector terminal that is made up of the members. The collector portions of the electrodes and the members that clamp the collector portions are welded.

Abstract: A secondary battery includes: an electrode body including an electrode main body, a collector foil protrusion section, and a collector foil connection portion; a first collector terminal including a first extension part that is welded to the collector foil connection portion; and a second collector terminal that is a member separate from the first collector terminal and includes a second extension part welded to the collector foil connection portion. The first extension part and the second extension part are located on the opposite sides of the collector foil connection portion. The secondary battery includes a welded joint at which both the first extension part and the second extension part are welded to the collector foil connection portion such that the first extension part, the second extension part, and the collector foil connection portion are united. The first collector terminal and the second collector terminal are united through the welded joint.

Abstract: A method of manufacturing an electric power storage device includes a connection step of connecting an exposed portion, which is provided at one end in a direction of width of an electrode and constructed without a composite material layer being provided in a current collector, and a collector terminal provided on an outer side relative to the exposed portion in the direction of width of the electrode to each other. In the connection step, while a metal layer composed of a second metal higher in melting point than a first metal which forms the collector terminal lies between the exposed portion and the collector terminal, at least a portion of contact of the collector terminal with the metal layer is irradiated with energy.

Abstract: An electric power storage device includes a case body with an opening, the opening formed at an upper portion of the case body; an electrode body housed in the case body; a tab portion; and a current collecting terminal. The tab portion protrudes from part of the electrode body toward the opening of the case body. The tab portion has a side surface not facing the electrode body. The current collecting terminal is welded to the side surface of the tab portion.

Abstract: A secondary cell manufacturing method includes placing a current collector terminal on a plurality of laminated current collector foils from a lamination direction of the current collector foils. The current collector terminal has a first end portion, and a second end portion forming a cutout with the first end portion. The second end portion includes a base part, and a thin-walled part having a smaller thickness than the base part. The secondary cell manufacturing method includes welding the plurality of current collector foils to the current collector terminal by scanning the plurality of current collector foils disposed in the cutout with a laser beam along the first extension direction toward the second end portion while irradiating the plurality of current collector foils with the laser beam.

Abstract: A secondary battery has an electrode laminated body and a collector member. The laminated body is formed of a laminated electrode sheet. The collector member is bonded to a collector foil laminated portion of the electrode sheet not formed with an active material layer. The collector foil laminated portion and the collector member are bonded at overlapped portions by resistance welding using electrodes. When a pressure welding direction is a projection direction, an area ratio (Yd)/(Xd) is 1.2-4, in which Xd is a projection area of a surface of the electrode made contact with the collector foil laminated portion and Yd is a projection area of a surface of the electrode made contact with the collector member.

Abstract: An electrical storage device includes a polar plate and a collector plate. The polar plate includes a mixture layer and a collector. The collector includes an exposed portion. The exposed portion is exposed from the mixture layer in one end of the polar plate in a width direction. The collector plate includes a facing portion, a projection portion, and a corner portion. The facing portion is opposed to a tip end surface of the exposed portion. The projection portion extends from the facing portion so as to project toward the exposed portion relative to the facing portion. The corner portion is placed in a boundary between the facing portion and the projection portion. The collector plate is welded to the exposed portion in at least part of the corner portion.