Abstract: A battery module includes a plurality of cylindrical batteries and lead plate connected to cylindrical batteries and electrically connecting the plurality of cylindrical batteries. Cylindrical battery includes can bottom valve including a thin-walled line ruptured and opening an exhaust port when an internal pressure of an outer covering can becomes higher than a threshold pressure. Lead plate includes double-supported arm arranged opposing a can bottom of cylindrical battery and coupled to lead plate at both ends at a position opposing can bottom valve, and gas permeation gap of exhaust gas ejected from the exhaust port on both sides of double-supported arm.

Abstract: The purpose of the present disclosure is to provide a non-aqueous electrolyte secondary battery that can suppress damage to an electrode body in the vicinity of an end of an insulation tape due to repetition of charging and discharging. A non-aqueous electrolyte secondary battery is characterized by comprising: an exterior body; a wound-type electrode body which is housed in the exterior body and in which a positive electrode and a negative electrode are wound with a separator interposed therebetween; and an insulation tape stuck to the electrode body. The non-aqueous electrolyte secondary battery is also characterized in that the insulation tape has a base material layer and an adhesive layer that is provided on a main surface of the base material layer, and a side surface of the base material layer is non-vertically inclined with respect to the main surface.

Abstract: The purpose of the present disclosure is to provide a nonaqueous electrolyte secondary battery configured to suppress the occurrence of internal short-circuiting in the vicinity of the inner side end of winding. This nonaqueous electrolyte secondary battery. according to one embodiment includes: an electrode body in which a positive electrode and a negative electrode are wound with a separator therebetween; a nonaqueous electrolyte; and an exterior body for housing the electrode body and the nonaqueous electrolyte. A negative electrode (12) includes a first negative electrode active material, and a second negative electrode active material, the second negative electrode active material exhibiting a greater expansion rate than the first negative electrode active material during charging.

Abstract: A conductive member is disposed on a side of the sealing plate adjacent to an electrode assembly with a first insulating member disposed therebetween. The conductive member has a conductive-member opening portion. The conductive-member opening portion of the conductive member is sealed by a deformation plate. The deformation plate is connected to a first positive-electrode current collector, which is electrically connected to positive electrode plates. A second insulating member is disposed between the deformation plate and the first positive-electrode current collector. Fixing projections and displacement prevention projections are provided on a surface of the second insulating member. The second insulating member is fixed to the first positive-electrode current collector such that the fixing projections are disposed in fixing holes in the first positive-electrode current collector.

Abstract: This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35 r of the center.

Abstract: The present disclosure provides a non-aqueous electrolytic solution secondary battery capable of suppressing increase of initial resistance when an isocyanate group-containing compound is added to a non-aqueous electrolytic solution. The non-aqueous electrolytic solution secondary battery according to one embodiment of the present disclosure has: a wound type electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween; and a battery case for housing the wound type electrode body and the non-aqueous electrolytic solution. The relation between a nitrogen element concentration A1 derived from an isocyanate group-containing compound in an outermost circumferential surface 2a of the wound type electrode body, and a nitrogen element concentration B derived from an isocyanate group-containing compound in an inner region located further in than the outermost circumferential surface of the wound type electrode body, satisfies A1>B.

Abstract: A separator for nonaqueous electrolyte secondary batteries according to one embodiment of the present disclosure comprises a porous base material and a heat-resistant porous film that is arranged on at least one surface of the porous base material so as to face an electrode of a nonaqueous electrolyte secondary battery. The heat-resistant porous film contains a filler and a binder; and at least a part of a facing part A of the heat-resistant porous film, said facing part A facing the edge portion of the electrode, has a higher binder content than a facing part B of the heat-resistant porous film, said facing part B facing the central portion of the electrode.

Abstract: A nonaqueous electrolyte secondary battery provided with a positive electrode, a negative electrode and a nonaqueous electrolyte. An electrode mixture layer of the positive electrode contains: first lithium metal composite oxide particles that are non-aggregated particles which have a volume-based median diameter of from 2 ?m to 10 ?m; and second lithium metal composite oxide particles that are secondary particles, in each of which primary particles having an average particle diameter of from 50 nm to 2 ?m aggregate, and which have a volume-based median diameter of from 10 ?m to 30 ?m. With a first region and the second region sequentially halved from the surface side of the positive electrode mixture layer, the content of the first lithium metal composite oxide particles in the first region is higher than the content of the first lithium metal composite oxide particles in the second region.

Abstract: An electrode for a non-aqueous electrolyte secondary battery, which is an example of an embodiment, has a belt-shaped negative electrode current collector and a negative electrode mixture layer formed on the surface of the negative electrode current collector. The negative electrode mixture layer contains a first Si-based active material and a second Si-based active material, each of which has a structure in which Si particles are dispersed in an oxide phase. The Si particle content in the first Si-based active material is higher than the Si particle content in the second Si-based active material, and, in the negative electrode mixture layer, the ratio of the mass of the first Si-based active material to the total mass of the first Si-based active material and the second Si-based active material is greater at the center than at the end in the width direction of the negative electrode current collector.

Abstract: At one edge of a positive electrode plate in a winding axis direction of an electrode body, two positive electrode tabs per turn are provided to protrude from the edge. At the other edge of a negative electrode plate in the winding axis direction of the electrode body, two negative electrode tabs per turn are provided to protrude from the edge. The multiple positive electrode tabs provided to protrude from the positive electrode plate include multiple types of positive electrode tabs having different protrusion lengths and proximal end widths, and the multiple negative electrode tabs provided to protrude from the negative electrode plate include multiple types of negative electrode tabs having different protrusion lengths and base end widths.

Abstract: The purpose of the present disclosure is to provide a nonaqueous electrolyte secondary battery that has excellent cycle characteristics. A nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with: an electrode body that comprises a positive electrode, a negative electrode and a separator; and a nonaqueous electrolyte. A mixture layer of the negative electrode contains a negative electrode active material, at least either one of carboxymethyl cellulose or a salt thereof, and at least either one of sorbic acid or a salt thereof; and the content of the sorbic acid and/or a salt thereof is 1,500 ppm or less relative to the mass of the mixture layer.

Abstract: A first secondary battery cell and a second secondary battery cell each having a cylindrical shape and connected in series and/or in parallel with each other are aligned and housed in such postures that side surfaces of the cylindrical shapes face each other. A battery pack includes: a longitudinal partition plate disposed at an interface between the first secondary battery cell and the second secondary battery cell housed in an internal space of a housing case; a lead plate that crosses the longitudinal partition plate; and a lateral partition plate that covers the end surfaces of the first secondary battery cell and the second secondary battery cell. The lateral partition plate and the lead plate pass through a longitudinal side slit in a state of overlap between the lateral partition plate and the lead plate.

Abstract: A nonaqueous electrolyte secondary battery positive electrode according to an aspect of the present disclosure is provided with a positive electrode collector and a positive electrode mixture layer that is formed on the surface of the positive electrode collector. The positive electrode mixture layer contains a positive electrode active material, fibrous carbon, and nonfibrous carbon. When the positive electrode mixture layer is divided into two equal regions in the thickness direction, and the half of the regions that is on the positive electrode collector side is defined as a first region and the half of the regions that is on the outer surface side is defined as a second region, the mass proportion of the fibrous carbon with respect to the total mass of the fibrous carbon and the nonfibrous carbon in the first region is set to be less than that in the second region.

Abstract: The purpose of the present disclosure is to provide a battery accommodation tray in which the amount of material used is readily reduced and of which the strength is readily improved. The battery accommodation tray comprises a plurality of accommodation parts that respectively accommodate batteries and that are positioned at intervals from each other. The accommodation parts have insertion openings demarcated by insertion-side circular parts that have a circular shape when viewed from the insertion side of the batteries in the height direction (Z direction). The battery accommodation tray has insertion-side connection parts by which the outer peripheral surfaces of the insertion-side circular parts are connected to the outer peripheral surfaces of adjacent insertion-side circular parts. The plurality of insertion-side circular parts are connected by the plurality of insertion-side connection parts to form an integrated whole.

Abstract: A cylindrical battery is provided with: an electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween; an electrolyte; a bottomed cylindrical outer can accommodating the electrode body and the electrolyte; a sealing plate blocking an opening portion of the outer can; a gasket disposed on a peripheral edge portion of the sealing plate; and an upper insulating plate disposed between the electrode body and the sealing plate. The gasket is compressed in the radial direction between an edge surface of the peripheral edge portion of the sealing plate and the outer can, and the outer can includes a locking portion with which a peripheral edge portion of the upper insulating plate engages.

Abstract: A battery system includes a battery block having a plurality of square battery cells (1) stacked in one direction, parallel connection bus bars (5X), insulating plate (7), and lid plate (8) fixed to insulating plate (7). Each square battery cell (1) has a discharge port provided with discharge valve (14) and a sealing plate provided with positive and negative electrode terminals via an insulating material. Parallel connection bus bars (5X) are connected to the electrode terminals to connect some or all of square battery cells (1) in parallel. Insulating plate (7) is disposed on the surfaces of sealing plates of the plurality of square battery cells (1) and includes passing portions having openings provided at positions corresponding to the discharge ports to pass the exhaust gas ejected from the discharge ports and pressing portions (22) disposed between parallel-connection bus bars (5X) and the sealing plates. Lid plate (8) faces discharge ports facing the openings of the passing portions.

Abstract: A battery according to an aspect of the present disclosure includes: a positive electrode, a negative electrode, a positive electrode tab electrically connected to the positive electrode; a negative electrode tab electrically connected to the negative electrode; a positive electrode tab tape covering the positive electrode tab: and a negative electrode tab tape covering the negative electrode tab. In the battery described above, at least one tab tape of the positive electrode tab tape and the negative electrode tab tape has a multilayer structure in which an adhesive layer and a substrate layer primarily formed from an organic material are laminated in this order from an electrode tab side, and the adhesive layer contains an adhesive material and a reactive material which generates an endothermic reaction at a temperature lower than a heat resistance temperature of the organic material.

Abstract: A method of manufacturing a secondary battery includes the following steps. An insertion portion of a negative-electrode terminal is inserted into a terminal connection hole that is formed in a first negative-electrode current collector and crimped on a tapered portion to form a crimped portion. A gap is formed between the crimped portion and the tapered portion. Energy rays are radiated toward at least one of the crimped portion and the tapered portion to melt the at least one of the crimped portion and the tapered portion such that a melted metal flows into the gap. The melted metal is solidified to form a solidified portion, and the negative-electrode terminal and the first negative-electrode current collector are joined to each other. The solidified portion has a recessed portion.

Abstract: A power supply device includes: a battery stack body that includes a plurality of secondary battery cells that are stacked; a pair of end plates disposed on both end surfaces of the battery stack body, respectively; and binding bars that are disposed on both the end surfaces of the battery stack body, respectively, and bind the pair of end plates. Each of the binding bars includes engaging steps that are opposite the pair of end plates, respectively. Each of the engaging steps extends in a direction intersecting with a stack direction of the battery stack body. Each of the pair of end plates includes engaging protrusions that are opposite the binding bars, respectively. The engaging protrusions engage with engaging steps. Consequently, rigidity that binds the battery stack body together is increased without changing a material and a thickness of the binding bars.

Abstract: This cathode active material for a secondary battery using a non-aqueous electrolyte includes nickel-rich lithium transition-metal oxide, exhibits a hard X-ray photoelectron spectroscopy (HAXPES) peak of 1,560 to 1,565 eV in binding energy from an Al-rich layer, using a photon energy of 6 KeV, and with respect to the mean particle diameter r of the lithium transition-metal oxide particle, the Al concentration is approximately constant within 0.35r of the center.