Abstract: A battery cell includes: an elongated electrode body that is formed by laminating a positive electrode, a negative electrode, and a separator; a band-shaped tape that extends in a short direction of the electrode body and that is wound around an outer periphery of the electrode body; and a laminate film that seals the electrode body in a state in which the electrode body around which the tape is wound is accommodated therein, wherein a recess is provided at a portion of an adhesive surface, of the tape, that adheres to the electrode body, the recess being recessed more than other portions of the adhesive surface.

Abstract: In a method of manufacturing an electrode body, a slurry is applied on an electrode current collector, and a coating layer is formed so that an uncoated region is formed. The coating layer is dried to form an active material layer. At least one condition selected from the group consisting of: a first slurry applied to a central region of the coating layer; a second slurry applied to an end region adjacent to the non-coated region at the periphery of the central region; and (A) a second slurry having a lower NV than the first slurry; (B) a tap-density of an active material in which the second slurry is included than the first slurry; (C) a second slurry having a lower binder content than the first slurry; and (D) a glass transition temperature of a binder in which the second slurry is included than the first slurry.

Abstract: A method of manufacturing a collector with an electrode of the present disclosure has a step of fabricating a collector with a coating, and a step of fabricating a collector with an electrode. In fabricating the collector with a coating, a composite material slurry is coated on a collector that is a sheet-shaped collector having plural through-holes or is a web-shaped collector having plural through-holes, and a collector with a coating, which has at least one coating of the composite material slurry, is fabricated. In fabricating the collector with an electrode, cooling air is blown onto the through-holes simultaneously with irradiating of light for heating onto the coating of the collector with a coating, and drying the coating to form a positive electrode layer or a negative electrode layer is formed, and the collector with an electrode is fabricated.

Abstract: The battery cell includes an electrode body formed by laminating a cathode, an anode, and a separator, and a laminate film that seals the electrode body in a state in which the electrode body is accommodated, and the anode includes a current collector coated with an anode composite material containing an anode active material, and the anode active material contained in the anode composite material is smaller in the middle portion than in the end portion.

Abstract: The battery module includes an elongated battery cell composed of an electrode assembly sealed by a laminated film, a case capable of accommodating a battery cell group in which a plurality of battery cells is arranged, and a strain sensor provided in at least one of the battery cell and the case and capable of detecting strain.

Abstract: A battery module includes elongated battery cells each formed by sealing an electrode body with a laminate film, and a case capable of accommodating a battery cell group in which a plurality of the battery cells are arranged, wherein the case is configured to include a pair of short side wall portions extending along a lamination direction of the battery cells, and a pair of long side wall portions that connect the short side wall portions to each other, and the long side wall portions are formed in a shape that is more difficult to deform in a plate thickness direction than the short side wall portions.

Abstract: A battery module includes: a plurality of battery cells, each battery cell being formed by sealing an electrode assembly with a lamination film; and a case capable of housing a battery cell group configured by an array of the plurality of battery cells, wherein a lubricant is provided between the battery cell group and the case.

Abstract: A battery module includes: a plurality of battery cells, each battery cell being formed by sealing, with a laminate film, an elongate electrode body; and a case in which the plurality of battery cells are housable in an arrayed state, wherein battery cells that are adjacent are adhered to each other by an adhesive, and wherein an amount of the adhesive differs between lengthwise direction central parts and end parts of the battery cells.

Abstract: A coating step of coating a slurry obtained by dispersing an electrode material on a current collector foil in a solvent to obtain a coating film, and a drying step of drying the coating film while transporting the current collector foil on which the coating film is formed in a drying furnace, the coating film, three regions divided along the transport direction, a central portion disposed in the center of the width direction, and an end portion disposed on both sides of the central portion, respectively, a drying step drying each end portion of the coating film by a heat source of low energy density, drying the central portion of the coating film by a high energy density heat source, an electrode manufacturing method.

Abstract: A battery module includes: a plurality of battery cells housed in an arrayed state inside a case; and a buffer member that is disposed at least one of between adjacent battery cells and between the battery cells and an inner wall of the case such that its thickness direction coincides with the array direction of the battery cells and is formed in such a way that a reaction force acting on the battery cells is smaller at its central portion than at its peripheral end portion.

Abstract: An electrode manufacturing method includes an application step of obtaining a coating film by coating a slurry obtained by dispersing an electrode material on a current collecting foil in a solvent to obtain a coating film, and a drying step of drying the coating film while transporting the current collecting foil from which the coating film is formed in the drying furnace interior, wherein the drying step irradiates at least one heat source to the coating film, the irradiation range of the heat source irradiated to the coating film has two regions divided by a straight line that divides the length in the transport direction of the irradiation range into two equal parts, and the ratio of the energy density of the heat source irradiated to the upstream region to the energy density of the heat source irradiated to the downstream region is 1.2 or more and 3.0 or less.

Abstract: The laminate film includes an accommodating portion for accommodating the electrode body, and seals the electrode body in the accommodated state. The accommodating portion has a side wall portion facing the peripheral end face of the electrode body, and an uneven portion is provided on at least a part of the side wall portion.

Abstract: A method of producing an electrode includes: (a) forming an active material layer; and (b) forming a groove on a surface of the active material layer by laser processing of the surface of the active material layer. In the laser processing, a pulsed laser having a pulse width of 200 ns or less is used; an ambient pressure is 980 hPa or more; and assist gas has a flow rate of 5 m/s or less.

Abstract: An electrode plate manufacturing apparatus includes: a first roll; a second roll that consolidates a particle aggregate and forms an undried active material film; and a third roll that transcribes the undried active material film on the second roll onto a current collector foil. A circumferential velocity A of the first roll, a circumferential velocity B of the second roll, a conveyance velocity C of the current collector foil, a contact angle ? of the first roll, a contact angle ? of the second roll, and a contact angle ? of the current collector foil satisfy conditions (i) ?????1.6×B/A+40 where ???>0 and B/A?1 and (ii) ?????1.6×C/B+40 where ???>0 and C/B?1.

Abstract: A manufacturing method of a lithium ion secondary battery includes: forming a first mixture by mixing powder of a first electrode material, which is one of the active material and the conductive material, with powder of trilithium phosphate; forming a second mixture by mixing the first mixture with powder of a second electrode material which is the other one of the active material and the conductive material; forming a wet granulated body by mixing the second mixture with the binder and a solvent; and forming the active material layer by attaching the wet granulated body to the surface of the current collector foil.

Abstract: An electrode production method by which an electrode including an electrode active material layer formed on a surface of a current collecting member is produced includes, when a material having a lower bulk density between an electrode active material and a conductive material is used as a first substance and a material having a higher bulk density is used as a second substance, wetting the first substance with a solvent to prepare a wet substance, performing first mixing in which the wet substance and the second substance are mixed to prepare a preceding mixture, and performing second mixing in which the preceding mixture, a binder, and the solvent are mixed and granulated to prepare a wet granulated substance.

Abstract: An electrode plate manufacturing apparatus includes: a first roll; a second roll that consolidates a particle aggregate and forms an undried active material film; and a third roll that transcribes the undried active material film on the second roll onto a current collector foil. A circumferential velocity A of the first roll, a circumferential velocity B of the second roll, a conveyance velocity C of the current collector foil, a contact angle ? of the first roll, a contact angle ? of the second roll, and a contact angle ? of the current collector foil satisfy conditions (i) ?????1.6×B/A+40 where ???>0 and B/A?1 and (ii) ?????1.6×C/B+40 where ???>0 and C/B?1.

Abstract: An electrode production method by which an electrode including an electrode active material layer formed on a surface of a current collecting member is produced includes, when a material having a lower bulk density between an electrode active material and a conductive material is used as a first substance and a material having a higher bulk density is used as a second substance, wetting the first substance with a solvent to prepare a wet substance, performing first mixing in which the wet substance and the second substance are mixed to prepare a preceding mixture, and performing second mixing in which the preceding mixture, a binder, and the solvent are mixed and granulated to prepare a wet granulated substance.

Abstract: A method of producing a negative electrode plate includes mixing a negative electrode mixture material containing a negative electrode active material and a binding material with a solvent and forming a wet granulated body and rolling the wet granulated body to pass through a gap between a pair of rolls, molding the body in a sheet form, and adhering the body to a surface of a negative electrode current collecting foil. Moreover, when the wet granulated body is formed, a powder whose average particle size X ?m and tap density Y g/cm3 satisfy Y?0.0139X+0.4386 is used as a powder of the negative electrode active material.

Abstract: A manufacturing method of a lithium ion secondary battery includes: forming a first mixture by mixing powder of a first electrode material, which is one of the active material and the conductive material, with powder of trilithium phosphate; forming a second mixture by mixing the first mixture with powder of a second electrode material which is the other one of the active material and the conductive material; forming a wet granulated body by mixing the second mixture with the binder and a solvent; and forming the active material layer by attaching the wet granulated body to the surface of the current collector foil.