Abstract: A first negative electrode mixture layer contains a first negative electrode active material and a first water-soluble polymer material; and a second negative electrode mixture layer contains a second negative electrode active material and a second water-soluble polymer material. The ratio of the amount (S1) of the first water-soluble polymer material present on the surface of the first negative electrode active material to the amount (V1) of the first water-soluble polymer material present in voids among particles of the first negative electrode active material, namely S1/V1 is larger than the ratio of the amount (S2) of the second water-soluble polymer material present on the surface of the second negative electrode active material to the amount (V2) of the second water-soluble polymer material present in voids among particles of the second negative electrode active material, namely S2/V2.

Abstract: According to the present disclosure, a sealed battery comprises a cylindrical exterior can having a bottom, a sealing body closing one end of the exterior can, and an electrode assembly disposed in the exterior can. The sealing body includes a valve body. The valve body includes an annular or C-shaped first frangible portion, and an annular second frangible portion having an inside-portion area smaller than an inside-portion area of the first frangible portion. The valve body is configured such that a vent pressure when the second frangible portion is fractured is lower than a vent pressure when the first frangible portion is fractured.

Abstract: This electrode plate for a non-aqueous electrolyte secondary battery has: an electrode core having an undercoat layer formed on the surface thereof; an electrode mixture layer formed on the undercoat layer of the electrode core. The undercoat layer is obtained by applying an undercoat dispersion on the surface of the electrode core and drying the same. A conductive auxiliary agent used for the undercoat layer is formed of carbon nanotubes. The average diameter of the conductive auxiliary agent is 12 nm or less. The aspect ratio (average length/average diameter) of the conductive auxiliary agent is 4000 or greater. The thickness of the undercoat layer is 0.10 ?m or less.

Abstract: A circuit board soldering structure includes lead a plate inserted into a slit hole of a circuit board and soldered to a conductive pattern provided along the slit hole. The lead plate is made of an elastically-deformable metal plate thinner than an opening width (W) of slit hole. The lead plate includes insertion section inserted into the slit hole. The insertion section includes a bent section approaching from one of opposing inner surfaces of the slit hole facing each other toward another of the opposing inner surfaces of the slit hole. The bent section is disposed in the slit hole. The insertion section has both surfaces that are close to or contact corresponding opposing inner surfaces of the slit hole to solder the insertion section to the conductive pattern.

Abstract: This electrode plate for a non-aqueous electrolyte secondary battery comprises: an electrode core with an undercoat layer formed on the surface thereof; and an electrode composite layer formed on the undercoat layer of the electrode core. The undercoat layer can be obtained by applying an undercoat dispersion liquid on the surface of the electrode core and drying the dispersion liquid. The average diameter of an electroconductive auxiliary agent used for the undercoat layer is no greater than 12 nm. The molecular weight of a binder used for the undercoat layer is no less than 900,000. The thickness of the undercoat layer is no greater than 20 ?m. The molecular weight of a binder used for the electrode composite layer is no less than 900,000.

Abstract: The secondary cell—includes an exterior can, a sealing body closing one end of the exterior can, an electrode group disposed inside the exterior can, and an insulating plate disposed between the sealing body and the electrode group. In the electrode group, a positive electrode and a negative electrode are wound in a spiral shape with a separator interposed between. The insulating plate is shaped as a disc having a lead hole penetrated by a positive electrode lead drawn out from the electrode group, and a center hole penetrating the center part of the insulating plate. The outer edge of the lead hole includes a curve part positioned along an arc that is concentric with respect to the outer circumference of the insulating plate as seen in plan view, and linear parts-positioned along a chord linking the two ends of the arc.

Abstract: A positive-electrode core laminate of a portion of a positive-electrode core on which no positive-electrode active material layer is formed is bonded to a positive-electrode current collector by ultrasonic bonding. A core recess is formed in a bonding region of the positive-electrode core laminate bonded to the positive-electrode current collector by ultrasonic bonding, a region of the positive-electrode core laminate in which the core recess is formed includes a solid-state bonding layer and a central layer, the solid-state bonding layer being formed by solid-state bonding between layers of the positive-electrode core, the central layer being disposed between the solid-state bonding layers formed on both faces of the positive-electrode core, and the first average grain size of metal crystal grains constituting the solid-state bonding layer is smaller than the second average grain size of metal crystal grains constituting the central layer.

Abstract: This nonaqueous electrolyte secondary battery is provided with an electrode body that is obtained by alternately laminating a plurality of positive electrodes and a plurality of negative electrodes, with separators being interposed therebetween. Each separator is configured of a porous resin substrate and a porous heat-resistant layer that is formed on one surface of the resin substrate and has a larger surface roughness than the resin substrate. The electrode body comprises: bonding particles that bond a negative electrode and a heat-resistant layer with each other; and bonding particles that bond a positive electrode and a resin substrate with each other. The mass of the bonding particles per unit area in a first interface between the negative electrode and the heat-resistant layer is larger than the mass of the bonding particles per unit area in a second interface between the positive electrode and the resin substrate.

Abstract: A secondary battery production method is provided, with which deformation of a current collector is reduced. The method produces a secondary battery including: an electrode assembly having positive and negative electrode plates; and a positive electrode current collector. The positive electrode plate includes a positive electrode core and a positive electrode active material layer, and the electrode assembly includes a positive electrode core-stacked portion. The method includes: an electrode assembly production step of producing the electrode assembly; and an ultrasonic bonding step of ultrasonically bonding the positive electrode current collector to the positive electrode core-stacked portion. The positive electrode current collector has a thin-walled portion.

Abstract: A negative-electrode core laminate of a portion of a negative-electrode core on which no negative-electrode active material layer is formed is bonded to a negative-electrode current collector by ultrasonic bonding. A core recess is formed in a bonding region of the negative-electrode core laminate bonded to the negative-electrode current collector by ultrasonic bonding, a region of the negative-electrode core laminate in which the core recess is formed includes a solid-state bonding layer and a central layer, the solid-state bonding layer being formed by solid-state bonding between layers of the negative-electrode core, the central layer being disposed between the solid-state bonding layers formed on both faces of the negative-electrode core. The average grain size of metal crystal grains constituting the solid-state bonding layer is smaller than the average grain size of metal crystal grains constituting the central layer.

Abstract: The sealed battery according to the present disclosure is provided with: an electrode body including a negative electrode and a positive electrode having a positive electrode tab; a bottomed cylindrical exterior body for housing the electrode body; and a sealing body for sealing the opening portion of the exterior body via a gasket. The sealing body includes a metal valve body. The valve body has a peripheral edge portion and a reverse portion more protruding to the electrode body side than the peripheral edge portion. The positive electrode tab is led out from the electrode body, is connected to the reverse portion, and has a non-linear portion in a range surrounded by the electrode body and the reverse portion. The non-linear portion has a recess portion and a protrusion portion facing each other at both ends along the led-out direction of the positive electrode tab in a plan view.

Abstract: A battery pack includes: a connector holder that is fixed to an exterior case and has two main surfaces that include a first main surface exposed through an opening of the exterior case; a floating connector connected with a center of the connector holder in such a manner that the floating connector floats in such a manner that an orientation or a position of the floating connector is variable upward, downward, leftward, and rightward; a lead wire fixed to an inner surface of the floating connector, the lead wire extending through an inside of the exterior case, and the lead wire connecting floating connector with a circuit board; and a positioning buffer that pushes the floating connector, and positions the floating connector at a predetermined original state when an external force is not applied to the floating connector.

Abstract: The purpose of the present disclosure is to provide a non-aqueous electrolyte secondary battery that can suppress reductions in rapid charge cycle characteristics. The non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure has a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode has a negative electrode collector and a negative electrode active material layer that is provided on the negative electrode collector. The negative electrode active material layer includes graphite particles A and graphite particles B as negative electrode active materials. The internal porosity of graphite particles A is no more than 5%, and the internal porosity of graphite particles B is 8%-20%. When the negative electrode active material layer is bisected in the thickness direction, there is a greater amount of graphite particles A in the outer surface-side half than in the negative electrode collector-side half.

Abstract: A non-aqueous electrolyte secondary cell according to the present invention comprises: an electrode body constituted by a plurality of positive electrodes and a plurality of negative electrodes alternately layered one by one with separators interposed therebetween; a non-aqueous electrolyte solution; and a case that houses the electrode body and the non-aqueous electrolyte solution. A solution injection port for injecting the electrolyte solution is provided in the case. The density of a first region separated from the solution injection port is less than the density of a second region, which is near the solution injection port, in positive electrode compound layers of the positive electrodes and/or negative electrode compound layers of the negative electrodes constituting the electrode body.

Abstract: A nonaqueous electrolyte secondary battery includes a negative electrode mixture layer formed on a negative electrode current collector. The negative electrode mixture layer includes a first layer and a second layer. The first layer is formed on the negative electrode current collector and includes a negative electrode active material and a first binding agent. The negative electrode active material in the first layer includes a carbon material A and a Si-containing compound. The second layer is formed on the first layer and includes a negative electrode active material and a second binding agent. The negative electrode active material in the second layer includes a carbon material B. The carbon material B has a tap density higher than a tap density of the carbon material A. A packing density of the second layer is lower than a packing density of the first layer.

Abstract: A secondary-battery electrode manufacturing method that allows a secondary-battery electrode including a neat linear cut portion to be stably manufactured at a high speed is provided. A method of manufacturing a secondary-battery electrode (10), which is an example of an embodiment, comprises a first step of forming an active material layer (22) on at least one surface of a long core body (21). The method of manufacturing the secondary-battery electrode (10), which is an example of the embodiment also comprises a second step of cutting an electrode precursor (20) into a predetermined shape by using a continuous wave laser, the electrode precursor (20) being the long core body (21) having the active material layer (22) formed thereon.

Abstract: An electrode plate which is to be contained in a wound or multilayer electrode body, and which is provided with: a band-like electrode plate core body; mixture layers that are formed on both surfaces of the electrode plate core body; and a tab that extends from one end of the electrode plate core body in the short-side direction. With respect to this electrode plate, the front edge of the electrode plate core body at the end from which the tab extends is covered by the mixture layers.

Abstract: This positive electrode for nonaqueous electrolyte secondary batteries is provided with a positive electrode core body and a positive electrode mixture layer that is formed on the surface of the positive electrode core body. The positive electrode mixture layer has a void fraction of from 23% by volume to 50% by volume; the positive electrode mixture layer contains at least a positive electrode active material, carbon nanotubes serving as a conductive assistant, and a polyvinylidene fluoride serving as a binder; the carbon nanotubes have a particle diameter of from 5 nm to 40 nm and an aspect ratio of from 100 to 1,000; the content of the carbon nanotubes in the positive electrode mixture layer is from 0.2% by mass to 5% by mass; and the number of polyvinylidene fluoride molecules contained per unit mass of the positive electrode mixture layer is from 0.005 to 0.030.

Abstract: A secondary battery configured so as to comprise: a plurality of positive electrodes each including a positive electrode core and a positive electrode active substance disposed on the positive electrode core; a plurality of negative electrodes each including a negative electrode core and a negative electrode active substance disposed upon the negative electrode core; at least one separator; and an adhesive coated so as to have a substantially constant area density on at least one side surface in the thickness direction of the separator. The secondary battery includes a laminated section in which the positive electrodes and the negative electrodes are alternately stacked, having the separator therebetween. The area of adhered sections adhered by the adhesive is greater on the outside in the lamination direction of the laminated section than on the inside in the lamination direction.

Abstract: Each of the Ni-containing lithium-based complex oxide A and the Ni-containing lithium-based complex oxide B contains Ni in an amount of 55 mol % or more relative to the total number of moles of metal elements excluding Li, the Ni-containing lithium-based complex oxide A has an average primary particle diameter of 2 ?m or more, an average secondary particle diameter of 2 to 6 ?m, a particle fracture load of 5 to 35 mN and a BET specific surface area of 0.5 m2/g to 1.0 m2/g, and the Ni-containing lithium-based complex oxide B has an average primary particle diameter of 1 ?m or less, an average secondary particle diameter of 10 to 20 ?m, a particle fracture load of 10 to 35 mN and a BET specific surface area of 0.1 m2/g to 1.0 m2/g.