Abstract: A battery case for a secondary battery having a gas discharge valve provided on one flat surface, wherein the gas discharge valve comprises a first thin portion having a thickness smaller than that of the flat surface and a second thin portion formed on a surface of the first thin portion, and having a thickness even smaller than that of the first thin portion, and a residual stress at the first thin portion is greater than that at the second thin portion.

Abstract: A power storage device includes a plurality of flat wound electrode bodies and a case in which the plurality of electrode bodies is housed. The case includes a flat-plate-shaped first case wall portion contacting one of the electrode bodies on one side in an electrode-body thickness direction, a flat-plate-shaped second case wall portion contacting another one of the electrode bodies on the other side in the electrode-body thickness direction, and a third case wall portion having the same number of one-side semi-cylindrical inner wall surfaces as the number of the electrode bodies, arranged side by side in the electrode-body thickness direction. The one-side semi-cylindrical inner wall surfaces form semi-cylindrical surfaces conforming to outer peripheral surfaces of the one-side rounded portions of the electrode bodies and contacting the outer peripheral surfaces.

Abstract: A battery case for a secondary battery having a gas discharge valve provided on one flat surface, wherein the gas discharge valve comprises a first thin portion having a thickness smaller than that of the flat surface and a second thin portion formed on a surface of the first thin portion, and having a thickness even smaller than that of the first thin portion, and a surface of the second thin portion has an etching mark.

Abstract: A battery pack includes battery cells and a restraint mechanism. Each of the battery cells has a battery can consisting of an extruded case body in the form of a quadrangular tube that is open at opposite ends in an axial direction, and a pair of lids that seal the opposite ends. The extruded case body has a pair of long side portions extending in the axial direction (Z direction), and an upper short side portion and a lower short side portion. The restraint mechanism holds the battery cells in place by applying pressure to the battery cells. The restraint mechanism includes a cooling unit that contacts the lower short side portion and cools the battery cells, and the widthwise opposite end portions of the lower short side portion are formed to be engageable from above with protrusions formed on an upper surface of the cooling unit.

Abstract: A battery cell that forms a secondary battery includes an electrode body, and a battery can made of metal and having an extruded can in the form of a quadrangular tube which contains the electrode body and is open at opposite ends in an axial direction, and lids that seal the opposite ends of the extruded can. The extruded can includes a pair of long side portions extending in the axial direction, and an upper short side portion and a lower short side portion perpendicular to the long side portions. The lower short side portion has a larger thickness than the upper short side portion.

Abstract: A method for manufacturing a tubular device case body made of metal includes inserting an insertion unit of a cutting assist device into a metal tubular member from a leading-end opening of the metal tubular member beyond a ring-shaped to-be-cut portion, cutting the to-be-cut portion by irradiation of a laser beam thereto from outside in a radial direction of the metal tubular member to obtain the device case body, and removing the insertion unit from the metal tubular member with the device case body cut. The insertion unit includes a facing recess, which is recessed to the inside in the radial direction and has a ring-shaped facing opening that faces the to-be-cut portion. The cutting is performed by cutting the metal tubular member while a penetrating laser beam passing through the metal tubular member is received by the facing recess.

Abstract: In an aluminum member, a member body made of metal aluminum (a lid member and a positive terminal member) is formed, on its member surface, with protrusions (a lid upper-surface protrusion layer, a lid lower-surface protrusion layer, a terminal side-surface protrusion layer, a terminal lower-surface protrusion layer) having a nano-order diameter of less than 1 ?m and a nano-order height of less than 1 ?m, which are densely arranged. Proximal end portions of the protrusions, continuous to the member surface, contains amorphous alumina and ?-alumina.

Abstract: In one embodiment, a method of dismantling an electricity storage device includes: preparing a battery; cutting the battery with a band saw blade; and applying a laser beam to cutting chips adhering to the band saw blade to remove the cutting chips adhering to the band saw blade.

Abstract: A method of dismantling a battery includes a cutting step, a heating step, and a removing step. In one embodiment, the cutting step cuts a case of the battery with a band saw blade made of a material having a higher melting point than a material making up the case. The heating step heats the band saw blade to a temperature that is higher than the melting point of the material making up the case and is lower than the melting point of the material making up the band saw blade. The removing step removes cutting chips adhering to the band saw blade by applying an external force to the band saw blade that is heated in the heating step.

Abstract: A battery includes a unit member in which a positive-electrode resin member made of resin is joined to each of a lid and a positive terminal member, which are made of metal. The lid and the positive terminal member are formed, on respective surfaces, with protrusions that have an average diameter of less than 1 ?m on a nano-order and are arranged in a densely reticulated arrangement. The resin forming the positive-electrode resin member intrudes into each gap between at least distal ends of the adjacent protrusions, so that the positive-electrode resin member is joined to at least the distal ends of the protrusions.

Abstract: Provided is a technique to break a case properly when an internal pressure of the case reaches a predetermined pressure. A herein disclosed energy storage device includes a case that is made of a first metal, includes a metallic piece that is welded to the case and that is made of a second metal being different from the first metal, and includes an intermetallic compound of the first metal and the second metal, the intermetallic compound being provided on a welded part of the case and the metallic piece.

Abstract: The present disclosure provides an electrical energy storage device including an electrode body, a case main body that includes an opening, a sealing plate that seals the opening, a welding joining part, and a shielding part that shields a gap between the welding joining part and the electrode body inside the case main body, in which in a peripheral edge of the welding joining part, a space that is surrounded by the shielding part, the case main body, and the sealing plate is secured.

Abstract: A busbar disclosed herein includes: a first metallic member including a first plate portion; a second metallic member including a second plate portion; a swaged joint formed by plastically deforming the first plate portion of the first metallic member and the second plate portion of the second metallic member such that the first plate portion and the second plate portion are swaged together; and a metal joint formed by metal-joining the first plate portion of the first metallic member to the second plate portion of the second metallic member.

Abstract: An electricity storage module 100 includes plural electricity storage devices, a restriction member 110, and a spacer 120. The plural electricity storage devices include a pair of opposed wide width surfaces 11b1, 11b2, and the wide width surfaces 11b1, 11b2 are arranged to be opposed to each other. The restriction member 110 is configured to restrict the plural electricity storage devices in a direction along which the wide width surfaces 11b1, 11b2 of plural electricity storage devices are arranged to be opposed to each other. The spacer 120 is arranged between an electricity storage device arranged at a first end part 2a in a direction along which the plural devices are arranged and the restriction member 110, and a thickness becomes smaller when a load being larger than a predetermined load is applied along the direction in which the electricity storage devices are arranged.

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 method for disassembling a laminated battery includes: preparing a laminated battery including a laminate, an electrode body enclosed in the laminate, and an electrolyte enclosed in the laminate; and heating the laminated battery until at least the laminate is unsealed.

Abstract: A method for disassembling a power storage device includes: preparing a power storage device in which a positive electrode and a negative electrode are housed in a case, the negative electrode is electrically connected to the case, and the positive electrode is insulated from the case; separating a portion of the case where the case is electrically connected to the negative electrode, from the case; and cutting another portion of the case after the separating.

Abstract: A device interconnection member for connecting a first electrode terminal made of first metal in one power storage device and a second electrode terminal made of second metal in another power storage device includes a first conductive member made of the first metal and to be connected to the first electrode terminal, a second conductive member made of the second metal and to be connected to the second electrode terminal, a joint portion where a first joined portion of the first conductive member and a second joined portion of the second conductive member are joined, and a resin seal member hermetically sealing the joint portion.

Abstract: A disassembly method for a battery disclosed herein includes a removal step of removing an electrode assembly from the battery. The method also includes an immersion step of immersing at least a part of the removed electrode assembly in a liquid. The method further includes a separation step of separating the positive electrode current collector foil and the negative electrode current collector foil from each other by pulling at least one of the positive electrode current collector foil and the negative electrode current collector foil, which are immersed in the liquid, so as to displace the positive electrode current collector foil and the negative electrode current collector foil in a direction intersecting the laminating direction thereof.

Abstract: The secondary battery includes a battery case. This battery case includes a battery case main body and includes a sealing plate. This battery case main body includes a pair of wide width side surfaces that are opposed mutually, and includes a pair of narrow width side surfaces that are opposed mutually. The sealing plate includes a peripheral part and a central part that is flat. Regarding the sealing plate, an end surface of a peripheral edge of the peripheral part is joined to end surfaces of the pair of wide width side surfaces and joined to end surfaces of the pair of narrow width side surfaces. The peripheral part is bent over a whole circumference of it to make the battery outer surface side from the central part of the sealing plate toward the end surface of the peripheral edge of the peripheral part be a convex surface.