Abstract: The gas discharging valve provided in a case according to the electrical energy storage device disclosed herein comprises In this embodiment a region 1 to a region 8 in the groove portion having a planar shape of an ellipse. The thicknesses of the residual wall portion in the region 1 to the region 8 are designated as Tr1 to Tr8, respectively. At this time, the thickness Tr3 of the residual wall portion in the third region is smaller than the thicknesses of the residual wall portion in the other regions except for the thickness Tr7 of the residual wall portion in the seventh region, and the thickness Tr7 of the residual wall portion in the seventh region is smaller than the thicknesses of the residual wall portion in the other regions except for the thickness Tr3 of the residual wall portion in the third region.

Abstract: A method for disassembling an electrode assembly disclosed here includes: preparing an electrode assembly formed by stacking a strip-like first separator, a strip-like negative electrode, a strip-like second separator, and a strip-like positive electrode in this order and winding the stack in a predetermined winding direction; separating the electrode assembly into the first separator and the negative electrode, and the second separator and the positive electrode at a winding end portion of the electrode assembly; and pulling the first separator and the second separator, respectively, to unwind the electrode assembly. The unwinding includes applying an impact to at least one of the unwound first separator and the unwound second separator.

Abstract: A method for disassembling an electrode assembly disclosed here includes: preparing an electrode assembly formed by stacking a strip-like first separator, negative electrode, second separator, and positive electrode in this order and winding the stack; pulling the first separator and the second separator, respectively, to unwind the electrode assembly into a laminated sheet of the first separator and the negative electrode and a laminated sheet of the second separator and the positive electrode; and winding the laminated sheet of the first separator and the negative electrode around a first roll to deflect a transport path of the first separator, inserting a plate-like separation member into a portion where the transport path is deflected, and separating the negative electrode from the first separator to a first surface side and a second surface side of the separation member.

Abstract: An electrode body disassembly method includes an electrode body preparation step of preparing the wound electrode body in which a strip-shaped negative electrode sheet and a strip-shaped positive electrode sheet are laminated with a strip-shaped first separator sheet and a strip-shaped second separator sheet therebetween and wound in a predetermined winding direction, and a separation step of pulling the first separator sheet and the second separator sheet, and drawing out and separating the first separator sheet, the negative electrode sheet, the second separator sheet and the positive electrode sheet.

Abstract: A method for disassembling an electrode assembly disclosed here includes: preparing an electrode assembly formed by stacking a strip-like first separator, a strip-like negative electrode, a strip-like second separator, and a strip-like positive electrode in this order and winding the stack in a predetermined winding direction; separating the electrode assembly into the first separator and the negative electrode, and the second separator and the positive electrode at a winding end portion of the electrode assembly; and pulling the first separator and the second separator, respectively, to unwind the electrode assembly. The unwinding includes winding a not-yet-unwound portion of the electrode assembly around a roll that deflects a transport direction of a wound sheet.

Abstract: An electrode body disassembly method includes a preparation step of preparing the electrode body in which a strip-shaped first separator sheet, a strip-shaped second separator sheet, a strip-shaped negative electrode sheet having a shorter length in a longitudinal direction thereof than the first separator sheet and the second separator sheet, and a strip-shaped positive electrode sheet having a shorter length in the longitudinal direction of the negative electrode sheet are laminated and wound in a predetermined winding direction thereof, and a separation step of pulling the first separator sheet and the second separator sheet and disassembling the electrode body such that the negative electrode sheet and the positive electrode sheet are separated from the first separator sheet and the second separator sheet in a state where innermost peripheral parts of the first separator sheet and the second separator sheet are fixed.

Abstract: An electrode body disassembly device includes a pair of first nip rollers that nip a strip-shaped first separator sheet and a transfer motor that rotates the first nip roller and transfers the first separator sheet. The first nip roller includes a wire. The wire extends in a tangential direction of the first nip roller and in a downstream direction in a transfer direction of the first separator sheet.

Abstract: An embodiment of the present application provides a processing method including a collecting step and a cutting step. The collecting step involves collecting a lithium ion battery including: an electrode body; a battery case housing the electrode body; and an electrode terminal connected to the electrode body and partially exposed to outside of the battery case. The cutting step involves cutting a connection between the electrode terminal and the electrode body of the collected lithium ion battery by using a water jet cutter. The processing method includes no lithium ion battery discharging step between the collecting step and the cutting step.

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.