Abstract: Provided is a cell pack having a restraint mechanism which withstands high restraining pressure. A cell pack includes a plurality of unit cells and a restraint mechanism for restraining these unit cells. The restraint mechanism includes: a first end plate portion disposed at an end portion in a first direction of the arrangement direction of the plurality of unit cells; a second end plate portion disposed at an end portion in a second direction of the arrangement direction of the plurality of unit cells; and a ring-shaped restraining hoop portion including a first support portion disposed on a surface of the first end plate portion in the first direction, a second support portion disposed on a surface of the second end plate portion in the second direction, and a pair of side wall portions continuously connecting the first support portion and the second support portion along the arrangement direction.

Abstract: A power storage cell includes a cell case and an electrode assembly. The cell case houses the electrode assembly. The cell case includes a top wall, a peripheral wall, and a bottom wall. The top wall faces the bottom wall. The peripheral wall connects the top wall and the bottom wall. The top wall is provided with an electrode terminal. A current path that electrically connects the electrode terminal and the electrode assembly is formed in the cell case. The current path includes a fuse portion. The power storage cell further includes at least one of a thermal expansion member and a thermal contraction member. The thermal expansion member is disposed between the top wall and the electrode assembly. The thermal contraction member is disposed between the electrode assembly and at least one of the peripheral wall and the bottom wall. The thermal contraction member supports the electrode assembly.

Abstract: A power storage cell includes a cell case, a wound electrode assembly, and an electrolyte solution. The cell case houses the wound electrode assembly and the electrolyte solution. The wound electrode assembly includes a positive electrode sheet, a separator sheet, and a negative electrode sheet. In a winding axis direction, the wound electrode assembly has a first end portion and a second end portion. The first end portion faces a top wall. The second end portion is located opposite to the first end portion. At both the first end portion and the second end portion, the separator sheet extends outward with respect to the negative electrode sheet. At the first end portion, the separator sheet has a first protruding length. At the second end portion, the separator sheet has a second protruding length. The first protruding length is longer than the second protruding length.

Abstract: A power storage cell comprises a cell case and an electrode assembly. The cell case accommodates the electrode assembly. The cell case includes an electrode terminal. An electric current path is formed inside the cell case. The electric current path electrically connects the electrode assembly with the electrode terminal. The electric current path includes a fuse portion. Tensile stress is applied to the fuse portion in a direction separating the fuse portion.

Abstract: A technology capable of sealing a target with higher airtightness is provided. The plug attaching device disclosed herein is for attaching, to a through hole of a target, a cylindrical plug having therein a non-through hole that has an opening in one end surface. The device includes an insertion pin, and a guide portion. The guide portion is slidable in the axial direction of the insertion pin. This device is configured such that the plug is disposed inside the through hole, the insertion pin is pushed into the non-through hole with the guide portion disposed on the periphery of the opening to attach the plug into the through hole, and after the attachment, the insertion pin is moved in an opposite direction to the non-through hole to remove the insertion pin from the non-through hole, and the guide portion is then detached from the opening.

Abstract: A manufacturing method of a laminated power storage device disclosed herein includes a step A of preparing an electrode body to which an electrode terminal is connected, a step B of preparing a laminated film, a step C of building a power storage device assembly in which the electrode body is covered with the laminated film and is sealed, and a step D of placing the power storage device assembly in a predetermined reduced-pressure atmosphere. The power storage device assembly has a welding portion in which the laminated films are stacked and welded together in a state in which part of the electrode terminal is protruded to the outside from between the laminated films around the electrode body. A pressure of the reduced-pressure atmosphere in the step D is set so as to guarantee that a weld strength of the welding portion is not less than a predetermined strength.

Abstract: A manufacturing method of a power storage device includes: an arrangement step of arranging a first resin member on a first surface of a metal foil and arranging a second resin member on a second surface of the metal foil; and a welding step of arranging a first pressurizing member and a second pressurizing member on a surface on an opposite side of the first resin member and the second resin member, respectively, from a surface on the metal foil side, and irradiating the end portion of the metal foil with an electromagnetic wave from the first pressurizing member side while pressurizing the end portion with the first pressurizing member and the second pressurizing member so as to weld the first resin member and the second resin member to the metal foil such that the end portion of the metal foil is covered.

Abstract: A manufacturing method for a welded structure includes preparing a stack in which a plate-shaped first welded member made of a first metal and a plate-shaped second welded member made of a second metal are stacked, and applying a laser beam to the first welded member such that multiple loop weld marks with the same central axis are provided. In applying the laser beam, the laser beam is applied such that irradiation energy gradually reduces from a predetermined one of the weld marks, located on an inner side, toward an outermost periphery.

Abstract: A manufacturing method of a welded structure in which metal members are welded to each other includes bringing the metal members into contact with each other so as to form a space surrounded by the metal members, a pressure reducing port is formed between the metal members or in at least one metal member of the metal members, the manufacturing method of the welded structure further includes performing a suction operation on the space through the pressure reducing port to depressurize the space so as to bring the first portion of the metal member into contact with the second portion of the metal member, or to make a distance between the first portion and the second portion smaller than that when the space is not depressurized; and welding the first portion and the second portion to each other in a state where the space is depressurized.

Abstract: A technology capable of sealing a target with higher airtightness is provided. The plug attaching device disclosed herein is for attaching, to a through hole of a target, a cylindrical plug having therein a non-through hole that has an opening in one end surface. The device includes an insertion pin, and a guide portion. The guide portion is slidable in the axial direction of the insertion pin. This device is configured such that the plug is disposed inside the through hole, the insertion pin is pushed into the non-through hole with the guide portion disposed on the periphery of the opening to attach the plug into the through hole, and after the attachment, the insertion pin is moved in an opposite direction to the non-through hole to remove the insertion pin from the non-through hole, and the guide portion is then detached from the opening.

Abstract: Provided are a cell pack having a restraint mechanism which is unlikely to be loosened or broken even when a restraining pressure is applied which is higher than, for example, in the related art, and also a method for producing and a method for disassembling the cell pack. A cell pack includes a plurality of unit cells arranged in an arrangement direction and a restraint mechanism for restraining these unit cells.

Abstract: A cell pack includes a plurality of unit cells arranged in an arrangement direction and a restraint mechanism for restraining these unit cells. The restraint mechanism includes: a first end plate portion disposed at an end portion in a first direction of the arrangement direction of the plurality of unit cells; a second end plate portion disposed at an end portion in a second direction of the arrangement direction of the plurality of unit cells; and a ring-shaped restraining hoop portion. A dimension in the arrangement direction between the first end plate portion and the second end plate portion of the restraining hoop portion is set such that a predetermined restraining pressure is applied in a direction of compressing the plurality of unit cells along the arrangement direction.

Abstract: A manufacturing method of a laminated power storage device disclosed herein includes a step A of preparing an electrode body to which an electrode terminal is connected, a step B of preparing a laminated film, a step C of building a power storage device assembly in which the electrode body is covered with the laminated film and is sealed, and a step D of placing the power storage device assembly in a predetermined reduced-pressure atmosphere. The power storage device assembly has a welding portion in which the laminated films are stacked and welded together in a state in which part of the electrode terminal is protruded to the outside from between the laminated films around the electrode body. A pressure of the reduced-pressure atmosphere in the step D is set so as to guarantee that a weld strength of the welding portion is not less than a predetermined strength.

Abstract: A secondary battery includes a battery case and a plurality of electrode assemblies housed in the battery case. The plurality of electrode assemblies are aligned in the battery case in a predetermined orderly arrangement. Positive electrode sheets of adjacent two of the electrode assemblies are electrically connected to each other by joining one of first and second positive electrode tabs of the adjacent two of the electrode assemblies to another one, and negative electrode sheets of the adjacent two of the electrode assemblies are electrically connected to each other by joining one of first and second negative electrode tabs of the adjacent two of the electrode assemblies to another one.

Abstract: A cell pack includes a plurality of unit cells arranged in an arrangement direction and a restraint mechanism for restraining these unit cells. The restraint mechanism includes: a first end plate portion disposed at an end portion in a first direction of the arrangement direction of the plurality of unit cells; a second end plate portion disposed at an end portion in a second direction of the arrangement direction of the plurality of unit cells; and a ring-shaped restraining hoop portion. A dimension in the arrangement direction between the first end plate portion and the second end plate portion of the restraining hoop portion is set such that a predetermined restraining pressure is applied in a direction of compressing the plurality of unit cells along the arrangement direction. A method for disassembling the cell pack is also provided.

Abstract: A cell pack includes a plurality of unit cells arranged in an arrangement direction and a restraint mechanism for restraining these unit cells. The restraint mechanism includes: a first end plate portion disposed at an end portion in a first direction of the arrangement direction of the plurality of unit cells; a second end plate portion disposed at an end portion in a second direction of the arrangement direction of the plurality of unit cells; and a ring-shaped restraining hoop portion A dimension in the arrangement direction between the first end plate portion and the second end plate portion of the restraining hoop portion is set such that a predetermined restraining pressure is applied in a direction of compressing the plurality of unit cells along the arrangement direction. A method for assembling the cell pack is also provided.

Abstract: Provided are a cell pack having a restraint mechanism which is unlikely to be loosened or broken even when a restraining pressure is applied which is higher than, for example, in the related art, and also a method for producing and a method for disassembling the cell pack. A cell pack includes a plurality of unit cells arranged in an arrangement direction and a restraint mechanism for restraining these unit cells.

Abstract: A laminate battery includes an electrode body, an exterior body consisting of a pair of exterior films, and an electrode terminal. The exterior body has a film welded portion in which the exterior films are welded to each other, and a terminal welded portion in which the exterior films are welded to the electrode terminal. The electrode terminal is covered with a thermally weldable film, and the thermally weldable film has a protruding portion that protrudes from a side face of the electrode terminal outward in a depth direction. The length of the protruding portion is equal to or larger than 50% of the thickness of the terminal welded portion, and is smaller than 100% of the length of the film welded portion.

Abstract: Provided are a cell pack having a restraint mechanism which is unlikely to be loosened or broken even when a restraining pressure is applied which is higher than, for example, in the related art, and also a method for producing and a method for disassembling the cell pack. A cell pack includes a plurality of unit cells arranged in an arrangement direction and a restraint mechanism for restraining these unit cells.

Abstract: A displacement adjustment member provided in a battery module disclosed herein has at least a first elastic body and a second elastic body capable of undergoing elastic deformation in the stacking direction of unit cells. The first elastic body is made of an elastic body in which an elastic deformation extent, with respect to a predetermined load, is relatively larger than that of the second elastic body.