Abstract: The present disclosure provides a joining technique capable of improving strength and reducing electrical resistance of a connecting portion that performs heterometal interjunction in a sealed battery. A mode of the sealed battery disclosed herein includes an electrode body, a battery case, a positive electrode internal terminal, a positive electrode external terminal, a negative electrode internal terminal, and a negative electrode external terminal. In the sealed battery, in a connecting portion between the negative electrode internal terminal and the negative electrode external terminal, an upper end of the negative electrode internal terminal and the negative electrode external terminal are stacked with a plated layer interposed therebetween and, at the same time, the negative electrode internal terminal and the negative electrode external terminal are joined to each other via the plated layer.

Abstract: A method for producing a power storage device includes forming a lid, forming a lid assembly, closing, and welding. In forming a lid, there is included forming, by forging, a protruding portion between a peripheral portion and an insertion-hole surrounding portion of the lid to block scattered light of a laser beam from being irradiated to a resin member, with a distance D from an end surface of the peripheral portion to a side surface of the protruding portion falling within 0.5t (D?0.5t) relative to a thickness t of the lid.

Abstract: A method for producing a power storage device includes placing a lid assembly that includes a lid and a terminal member integrated therewith via a resin member to close an opening portion of a case body with the lid, and laser-welding the opening portion of the case body and the peripheral portion of the lid over an entire circumference. In placing the lid assembly, a peripheral high-level region, in which a peripheral outer surface of the peripheral portion of the lid is located on the outer side relative to an opening end surface of the opening portion of the case body is provided in proximate long-side opening portions, close of the opening portion and proximate long-side peripheral portions of the peripheral portion.

Abstract: A method for producing a power storage device includes closing an opening portion of a case body with a lid of a lid assembly, and laser-welding the opening portion of the case body and a peripheral portion of the lid over their entire circumference. A resin member has an outer surface including a scattered light-reached surface to which scattered light of a laser beam directly reaches, at least a part of the scattered light-reached surface including a smoothed region having a surface roughness of 0.6 ?m or less.

Abstract: A battery terminal has a two-piece configuration of different types of conductive materials. A first piece placed outside and a second piece placed inside with including a current collecting portion are fixed in two portions of a first fixing portion and a second fixing portion. The first fixing portion is positioned between the current collecting portion and the second fixing portion in a longitudinal direction in a shape of the terminal. Leaning of the current collecting portion with respect to a center in a short-side direction and leaning of the first fixing portion with respect to a center are opposite to each other.

Abstract: The present disclosure provides a joining technique capable of improving strength and reducing electrical resistance of a connecting portion that performs heterometal interjunction in a sealed battery. A mode of the sealed battery disclosed herein includes an electrode body, a battery case, a positive electrode internal terminal, a positive electrode external terminal, a negative electrode internal terminal, and a negative electrode external terminal. In the sealed battery, in a connecting portion between the negative electrode internal terminal and the negative electrode external terminal, an upper end of the negative electrode internal terminal and the negative electrode external terminal are stacked with a plated layer interposed therebetween and, at the same time, the negative electrode internal terminal and the negative electrode external terminal are joined to each other via the plated layer.

Abstract: In a sealed battery provided with an electrode body and a battery case accommodating the electrode body, the battery case includes a case body having an opening and accommodating the electrode body, and a plate-shaped lid closing the opening of the case body. The lid includes a safety valve made of resin. The safety valve is formed with a ring-shaped groove that is recessed in a thickness direction of the lid and has a ring shape in plan view. In the safety valve, a thinnest portion having a thinnest thickness in the safety valve includes a ring-shaped thinnest portion of a ring shape in plan view including the bottom of the ring-shaped groove.

Abstract: In a sealed power storage device, a device case includes a resin case body with an opening and a resin lid closing the opening. The resin lid is made of electrical insulation resin. A metal terminal member is extended from inside to outside of the device case, penetrating through the resin lid. The resin lid is hermetically molded together with the metal terminal member so that the resin lid is directly joined to the outer peripheral surface of the metal terminal member without interposing another member between the resin lid and the metal terminal member.

Abstract: A sealed power storage device includes a device case having a metal wall portion formed with liquid inlet, and a sealing member sealing the liquid inlet to cover the liquid inlet from above an outer surface of the metal wall portion. The sealing member is a resin sealing member made of resin. The outer surface of the metal wall portion includes an annular seal surface surrounding an opening edge of the liquid inlet. The resin sealing member includes an annular joined portion hermetically joined to the annular seal surface.

Abstract: In a sealed battery, a battery case includes a metal wall portion formed with a gas vent hole. Of an outer surface of the metal wall portion, a hole-surrounding annular surface surrounding an opening edge of the gas vent hole includes an annular seal surface surrounding the opening edge of the gas vent hole. A resin safety valve member covering and closing the the gas vent hole includes an annular joined portion hermetically joined to the annular seal surface. The annular joined portion of the resin safety valve breaks when the internal pressure of the battery case reaches a valve opening pressure, thereby opening the resin safety valve member.

Abstract: In a sealed battery, a battery case includes a metal wall portion formed with a gas vent hole. The metal wall portion includes an annular seal surface surrounding an opening edge of the gas vent hole. A resin safety valve member closing the gas vent hole includes an annular joined portion hermetically joined to the annular seal surface and an inside portion located more inside than the annular joined portion in a radial direction. The inside portion breaks when the internal pressure of the battery case reaches a valve opening pressure, thereby opening the resin safety valve member.

Abstract: In a secondary battery, a lid member and a negative terminal are integrated through a resin. The negative terminal includes a first member and a second member. A first bonded surface of a lower surface of the first member is bonded to a second bonded surface of an upper surface of the second member. The first member includes a projecting portion at an outer peripheral edge of the lower surface of the first member. The second member includes a chamfered portion at an outer peripheral edge of the upper surface of the second member. The projecting portion and the chamfered portion are combined with each other so that the projecting portion contacts the chamfered portion.

Abstract: A method for producing a secondary battery includes a space formation step and an injection molding step. In the space formation step, an outer periphery of a resin blocking portion with a quadrangular prism shape, in a terminal, is plugged to form a resin injection space around the terminal. In the injection molding step, a resin is injected into the injection space. The space formation step includes a constant-dimension pressing step and a constant-pressure pressing step. In the constant-dimension pressing step, a section between a pair of first outer peripheral surfaces of the resin blocking portion, extending parallelly to each other is pressed, whereby a distance between the first outer peripheral surfaces is brought to a predetermined distance. In the constant-pressure pressing step, a section between a pair of second outer peripheral surfaces of the resin blocking portion, extending in a direction intersecting the first outer peripheral surfaces, is pressed.

Abstract: A lid body including: a terminal member of at least one electrode; a sealing plate having a mounting hole for attaching the terminal member; and a sealing material containing an inorganic filler. The terminal member is inserted into the mounting hole and is attached to the sealing plate in a state where the sealing material is joined to a peripheral edge portion of the mounting hole. In a microscope observation of a cross section of the sealing material, an average aspect ratio of the inorganic filler is 2 or higher, and with an average orientation angle of the inorganic filler is 30 degrees or smaller, in at least the sealing material formed on an outer surface of the sealing plate.

Abstract: Provided is a lid body including: a terminal member being mainly made up of a first metal; a sealing plate mainly made up of a second metal; and a sealing material. The sealing plate has a mounting hole for attaching the terminal member. The terminal member is inserted into the mounting hole and is attached to the sealing plate in a state where the sealing material is joined to a peripheral edge portion of the mounting hole. With as ?S a coefficient of linear expansion at 25° C. of the sealing material, ?1 as a coefficient of linear expansion at 25° C. of the first metal and ?2 as a coefficient of linear expansion at 25° C. of the second metal, ?L??S??H is satisfied, where ?H is the higher value and ?L is the lower value from among the ?1 and ?2.

Abstract: A secondary battery herein disclosed includes a power generating element, a battery case, and an electrode terminal. The electrode terminal includes a terminal part, an external connection part, and a molding resin part. The terminal part is connected to the power generating element. The external connection part contacts with the terminal part. The molding resin part covers the periphery of the connection surface between the external connection part and the terminal part in a state where a part of the external connection part is exposed to outside. The external connection part includes a step part between an outer circumferential portion of a connection surface between the external connection part and the terminal part, and an exposed part exposed from the molding resin part to the outside. The molding resin part covers both the outer circumferential portion of the connection surface and the step part.

Abstract: A method for producing a secondary battery includes a space formation step and an injection molding step. In the space formation step, an outer periphery of a resin blocking portion with a quadrangular prism shape, in a terminal, is plugged to form a resin injection space around the terminal. In the injection molding step, a resin is injected into the injection space. The space formation step includes a constant-dimension pressing step and a constant-pressure pressing step. In the constant-dimension pressing step, a section between a pair of first outer peripheral surfaces of the resin blocking portion, extending parallelly to each other is pressed, whereby a distance between the first outer peripheral surfaces is brought to a predetermined distance. In the constant-pressure pressing step, a section between a pair of second outer peripheral surfaces of the resin blocking portion, extending in a direction intersecting the first outer peripheral surfaces, is pressed.

Abstract: The present disclosure provides a joining technique capable of improving strength and reducing electrical resistance of a connecting portion that performs heterometal interjunction in a sealed battery. A mode of the sealed battery disclosed herein includes an electrode body, a battery case, a positive electrode internal terminal, a positive electrode external terminal, a negative electrode internal terminal, and a negative electrode external terminal. In the sealed battery, in a connecting portion between the negative electrode internal terminal and the negative electrode external terminal, an upper end of the negative electrode internal terminal and the negative electrode external terminal are stacked with a plated layer interposed therebetween and, at the same time, the negative electrode internal terminal and the negative electrode external terminal are joined to each other via the plated layer.

Abstract: A battery includes: an electricity-generating element; an exterior; an external terminal member; a current-collecting terminal member having a first end which is connected to the electricity-generating element and a second end, which extends outward of the exterior; and a platy connection member that, outside the exterior, interconnects the current-collecting terminal member and external terminal member. In the welding between the connection member and an outer peripheral side end portion of a swaged portion in which the second end of the current-collecting terminal member has been swaged toward an insertion hole of the connection member, an acute angle between a connecting line connecting the weld portion to a center of the second end and a longitudinally extending center line of the lid member is greater than or equal to 45 degrees. A production method for the battery and a battery production-purposed mask are also provided.

Abstract: A battery includes: an electricity-generating element; an exterior; an external terminal member; a current-collecting terminal member having a first end which is connected to the electricity-generating element and a second end, which extends outward of the exterior; and a platy connection member that, outside the exterior, interconnects the current-collecting terminal member and external terminal member. In the welding between the connection member and an outer peripheral side end portion of a swaged portion in which the second end of the current-collecting terminal member has been swaged toward an insertion hole of the connection member, an acute angle between a connecting line connecting the weld portion to a center of the second end and a longitudinally extending center line of the lid member is greater than or equal to 45 degrees. A production method for the battery and a battery production-purposed mask are also provided.