Abstract: A negative electrode producing method includes supplying metal foil functioning as a current collector with a negative electrode composite material containing a negative electrode active material including graphite, and applying, to the negative electrode active material, a magnetic field with lines of magnetic force pointing in a direction perpendicular to a surface of the metal foil. The applying the magnetic field to the negative electrode active material includes, while conveying the metal foil in a conveyance direction, continuously applying the magnetic field using a plurality of magnets, the magnets being disposed at predetermined intervals in the conveyance direction.

Abstract: A manufacturing method for a negative electrode includes: supplying a negative electrode mixed material containing graphite to a metal foil serving as a current collector; and applying a magnetic field to the negative electrode mixed material supplied to the metal foil. The supplying of the negative electrode mixed material is supplying the negative electrode mixed material to the metal foil conveyed along an outer peripheral surface of a magnet roll serving as a backup roll. The applying of the magnetic field includes a first magnetic field applying step of applying, by the magnet roll, a magnetic field to the negative electrode mixed material, and a second magnetic field applying step of further applying, after the metal foil supplied with the negative electrode mixed material passes the magnet roll, a magnetic field to the negative electrode mixed material.

Abstract: A method for producing a bipolar electrode includes: mixing, under shear, a mixture containing a positive electrode active material or negative electrode active material and a binder resin, and a fibrillizable compound, to respectively prepare a positive electrode powder and a negative electrode powder; rolling the positive electrode powder and the negative electrode powder to respectively form a positive electrode layer and a negative electrode layer; and compressing the positive electrode layer and the negative electrode layer by respectively applying different pressures thereto, to respectively adjust a porosity of the positive electrode layer and a porosity of the negative electrode layer.

Abstract: A method for producing a bipolar electrode includes obtaining a bipolar electrode respectively having a positive electrode mixture layer and a negative electrode mixture layer at both surfaces of an electrode foil through: a positive electrode mixture coating step of coating a positive electrode mixture coating liquid on one surface of an electrode foil and drying the positive electrode mixture coating liquid, to form a positive electrode mixture coating film; a first pressing step of pressing the electrode foil having the positive electrode mixture coating film; a negative electrode mixture coating step of coating a negative electrode mixture coating liquid on another surface of the electrode foil by a screen printing method and drying the negative electrode mixture coating liquid, to form a negative electrode mixture coating film; and a second pressing step of pressing the electrode foil having the negative electrode mixture coating film.

Abstract: A method of manufacturing an active material layer for a battery, the method including: preparing an active material layer, the active material layer containing a binder and an active material; and irradiating a nanosecond pulsed laser onto the active material layer under a condition of an inputted heat amount being greater than or equal to 0.005 J/mm2 and less than or equal to 0.050 J/mm2.

Abstract: A method of manufacturing an active material layer for a battery, the method including: preparing an active material layer, the active material layer containing a binder and an active material; and irradiating a femtosecond laser onto the active material layer under a condition of an inputted heat amount being greater than or equal to 0.04 J/mm2 and less than or equal to 0.32 J/mm2.

Abstract: The power storage cell includes a case, an electrolyte solution, and an electrode assembly. The electrode assembly includes a first electrode, a second electrode, a separator, and an interposition film. The first electrodes and the second electrodes are alternately stacked. The separator separates the first electrode from the second electrode. The interposition film is interposed between the first electrode and the separator. The interposition film includes a first region and a second region in a plane orthogonal to the stacking direction of the first electrode and the second electrode. The first region includes the center of the interposition film in a plane. The second region surrounds the periphery of the first region. The interposition film satisfies the relationship of the formula (1) “T2<T1”. T1 represents the thickness of the interposition film in the first region. T2 represents the thickness of the interposition film in the second region.

Abstract: The present disclosure provides a battery case that is formed by joining two battery case members to each other to improve the mechanical strength at a joined portion of the members. The battery case disclosed herein is a hexahedral box-shaped battery case including two rectangular wide faces, three rectangular side walls that are present between the two wide faces, and an opening part. The battery case is characterized in that the joined portion is included along the circumference (three sides) of the battery case.

Abstract: A power storage cell includes: an electrode assembly. The electrode assembly includes a plurality of positive electrodes and a plurality of negative electrodes disposed side by side in a thickness direction, and a separator. The electrode assembly has a shape longer in a width direction. The electrode assembly includes an upper portion, a bottom portion, a first end portion, and a second end portion. A first welding portion is formed in the first end portion. A second welding portion is formed in the second end portion. A third welding portion in contact with the first welding portion and a fourth welding portion in contact with the second welding portion are formed in the bottom portion. The third welding portion and the fourth welding portion are disposed at an interval with a central portion of the bottom portion being interposed between the third welding portion and the fourth welding portion.

Abstract: A method for manufacturing an electrode assembly includes: a stacking step of stacking a plurality of positive electrode units and a plurality of negative electrodes such that the positive electrode units alternate respectively with the negative electrodes, each positive electrode unit including a first resin portion, a second resin portion, a positive electrode, and a bag separator; a first cutting step of cutting a plurality of the first resin portions together with the bag separator along a stacking direction; a second cutting step of cutting a plurality of the second resin portions together with the bag separator along the stacking direction; a first welding step of welding together a pair of the first resin portions adjacent to each other in the stacking direction; and a second welding step of welding together a pair of the second resin portions adjacent to each other in the stacking direction.

Abstract: The present disclosure provides a method for manufacturing an angular battery having improved insertability of an electrode body. According to the present disclosure, there is provided a method for manufacturing an angular battery including a battery case that has a rectangular bottom surface and a pair of long side surfaces having, as one side thereof, a long side of the rectangular bottom surface and facing each other, and an electrode body that is accommodated in the battery case and wide surfaces facing the long side surfaces.

Abstract: A square battery includes a battery case containing therein an electrode body. The battery case includes a case main body having a square shape substantially in the form of a cuboid having an open side surface and a lid bonded to the case main body so as to close an opening of the case main body. The case main body includes a rectangular bottom surface portion, a pair of wider surface portions facing each other, and a pair of narrower surface portions facing each other. The wider surface portion and the narrower surface portion adjacent to each other are bonded together. In the opening of the case main body, an inner side of a corner portion between the wider surface portion and the narrower surface portion adjacent to each other has an R-shape, and an outer edge of the lid is welded to the inner side of the corner portion.

Abstract: A square battery includes a battery case containing therein an electrode body. The battery case includes a case main body having a square shape substantially in the form of a cuboid having an open side surface and a lid bonded to the case main body so as to close an opening of the case main body. The case main body includes a rectangular bottom surface portion, a pair of wider surface portions facing each other, and a pair of narrower surface portions facing each other. The wider surface portion and the narrower surface portion adjacent to each other are bonded together. In the opening of the case main body, an inner side of a corner portion between the wider surface portion and the narrower surface portion adjacent to each other has an R-shape, and an outer edge of the lid is welded to the inner side of the corner portion.

Abstract: The present disclosure provides a battery case that is formed by joining two battery case members to each other to improve the mechanical strength at a joined portion of the members. The battery case disclosed herein is a hexahedral box-shaped battery case including two rectangular wide faces, three rectangular side walls that are present between the two wide faces, and an opening part. The battery case is characterized in that the joined portion is included along the circumference (three sides) of the battery case.

Abstract: The present disclosure provides a method for manufacturing an angular battery having improved insertability of an electrode body. According to the present disclosure, there is provided a method for manufacturing an angular battery including a battery case that has a rectangular bottom surface and a pair of long side surfaces having, as one side thereof, a long side of the rectangular bottom surface and facing each other, and an electrode body that is accommodated in the battery case and wide surfaces facing the long side surfaces.