Abstract: A negative electrode for nonaqueous electrolyte secondary batteries with a negative electrode collector and a negative electrode active material layer thereon, with respect to the negative electrode active layer, first active material layers (X) and second active material layers (Y) are alternately arranged on the negative electrode collector, the first and second active material layers containing, as a negative electrode active material, graphite particles A and graphite particles B, while being different from each other in the content of the graphite particles A relative to the total mass of the graphite particles A and the graphite particles B. The internal void fraction of the graphite particles A is lower than the internal void fraction of the graphite particles B; the content of the graphite particles A in the first active material layers (X) is higher than the content of the graphite particles A in the second active material layers (Y).

Abstract: A battery pack includes battery cell having exhaust valve that opens when internal pressure exceeds set pressure, and case that houses battery cell. Case includes multiple case units molded with plastic, multiple case units being coupled with mating surfaces to dispose battery cell inside case, and heat-resistant material disposed inside mating surfaces of respective multiple case units, heat-resistant material blocking gap between mating surfaces.

Abstract: A non-aqueous electrolyte secondary battery according to an aspect of the present disclosure comprises: an electrode body in which a belt-shaped positive electrode and a belt-shaped negative electrode are wound with a separator therebetween; an electrolyte; and an outer case which accommodates the electrode body and the electrolyte. The negative electrode has a negative electrode current collector and a negative electrode mixture layer which is formed on a surface of the negative electrode current collector and which contains a negative electrode active material and a solid electrolyte. The negative electrode mixture layer has a region in which the solid electrolyte content in the inner winding end part is higher than the solid electrolyte content in the outer winding end part, and the solid electrolyte content continuously decreases from the inner winding end part side to the outer winding end part side.

Abstract: A battery pack includes a plurality of battery cells and holder that has battery cells arranged in a parallel posture. Holder has partition wall between adjacent battery cells for arranging battery cells at fixed positions. Partition wall has a surface facing battery cells as resin molded layer shaped to arrange battery cells at the fixed positions. Partition wall has a three-layer structure where thermally insulating plate is disposed inside and resin molded layer is laminated on both surfaces of thermally insulating plate. Holder is formed in a single-piece structure by molding resin molded layer from a synthetic resin.

Abstract: Battery cells may be heated safely and reliably. A power supply device includes a battery block (10) including battery cells including positive and negative electrodes at both ends, lead plate (2) connected to the positive and negative electrodes of the battery cells to electrically connect the battery cells, and a sheet heater (3) configured to heat the battery cells. The sheet heater (3) is thermally coupled and placed on one surface on the negative electrode of the battery cell via one of the lead plates (2).

Abstract: A non-aqueous electrolyte secondary battery provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode includes a 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 includes a first negative electrode mixture layer opposite to the negative electrode current collector, and a second negative electrode mixture layer laminated on the surface of the first negative electrode mixture layer. The negative electrode mixture layer includes graphite particles and a highly dielectric material having a higher dielectric constant than the graphite particles. The porosity between the graphite particles in the second negative electrode mixture layer is greater than in the first negative electrode mixture layer.

Abstract: In a nonaqueous electrolyte secondary battery, a negative electrode mix layer includes a first layer and a second layer disposed successively from a negative electrode collector. The first layer contains a first carbon-based active material having a 10% compressive strength of 3 MPa or less and a silicon-based active material containing Si. The second layer contains a second carbon-based active material having a 10% compressive strength of 5 MPa or more and has a lower content (mass ratio) of the silicon-based active material than the first layer.

Abstract: A battery with a laminate film outer package, configured by bonding film materials; and a flat electrode body contained in the laminate film outer package having a positive electrode with a positive electrode non-coated part, without a positive electrode mixture layer and an exposed positive electrode core body midway in the longitudinal direction; and a negative electrode has a negative electrode non-coated part without a negative electrode mixture layer and an exposed negative electrode core body midway in the longitudinal direction; and a positive electrode tab is bonded and electrically connected to the positive electrode non-coated part; and a negative electrode tab is bonded and electrically connected to the negative electrode non-coated part, both tabs generally pass through the center of the flat electrode body in the thickness direction, while being positioned on the same side of a virtual plane perpendicular to the thickness direction of the flat electrode body.

Abstract: This non-aqueous electrolyte secondary battery is characterized by comprising: a wound electrode body in which a positive electrode and a negative electrode are wound via a separator. Said battery is also characterized in that: when the separator is divided into five parts in the width direction and the five divided regions are defined as a region A positioned on one end of the separator in the width direction, a region B positioned on the other end of the separator in the width direction, a region C positioned in the center of the separator in the width direction, a region D positioned between the region A and the region C, and a region E positioned between the region B and the region C, then the void ratio of the region D and the region E is greater than the void ratio of the region A, the region B, and the region C.

Abstract: This sealed battery is provided with a bottomed tubular outer can for accommodating an electrode body, and a sealing body for sealing an opening part of the outer can. The outer can has a gas exhaust valve which ruptures when the pressure inside the battery reaches a predetermined value. The gas exhaust valve includes a plurality of linear grooves. The sealed battery is characterized in that; the cross-sectional shape of the grooves is a tapering shape in which the width of open ends on the side of the surface of the outer can is shorter than the width of the bottom; the grooves have at least one crossing part; and the crossing part has a flat section in the bottom.

Abstract: An insulating plate for a secondary battery includes a wound electrode group, an electrolyte, a cylindrical battery case that houses the electrode group and the electrolyte, and a sealing body that seals an opening of the battery case and includes a discharge valve. The insulating plate is disposed between the electrode group and the sealing body and has a disk shape with a thickness T of 0.1 mm or more. The insulating plate has a first hole formed centrally therein and at least one second hole formed around the first hole so as to extend along the outer periphery of the disk shape. The ratio (=T/D) of the thickness T to a diameter D of the insulating plate is 0.016 or less, and the insulating plate has an opening ratio of 36% or less.

Abstract: A nonaqueous electrolyte secondary battery is provided with a bottomed tubular outer can accommodating an electrode body, and a sealing body for sealing an opening portion of the outer can. A crimped portion for crimping and securing the sealing body is formed in the outer can by bending the edge portion of the opening portion inward in the radial direction, and the sealing body includes a rupture disk, a cathode cap including a flange, and a metal height adjusting portion for adjusting the height of the crimped portion.

Abstract: A nonaqueous electrolyte secondary battery (10) in an example embodiment includes a positive electrode (11) having a lithium metal composite oxide, and a negative electrode (12) having graphite. The lithium metal composite oxide includes first composite oxide particles which are secondary particles formed by aggregation of primary particles having an average particle size of 50 nm to 5 ?m, and second composite oxide particles which are non-aggregated particles having an average particle size of 2 ?m to 20 ?m. The positive electrode (11) has lower initial charge/discharge efficiency than the initial charge/discharge efficiency of the negative electrode (12).

Abstract: A non-aqueous electrolyte secondary battery positive electrode that is characterized by comprising a positive electrode collector and a positive electrode mixture layer that is provided on the positive electrode collector and includes a positive electrode active material and a conductive material that includes carbon nanotubes. The non-aqueous electrolyte secondary battery positive electrode is also characterized in that, when the positive electrode mixture layer is bisected in the thickness direction, the mass ratio of carbon nanotubes to positive electrode active material in an upper-half region that is on a top surface side is smaller than the mass ratio of carbon nanotubes to positive electrode active material in a lower-half region that is on the positive electrode collector side.

Abstract: A battery including: a battery can having a cylindrical portion, a bottom wall closing one end of the cylindrical portion, and an open rim continuous with the other end of the cylindrical portion; an electrode body housed in the cylindrical portion; and a sealing body fixed to the open rim so as to seal an opening defined by the open rim. The sealing body includes a sealing plate and a gasket disposed at a peripheral portion of the sealing plate. The gasket has at least one protruding portion configured to restrict insertion of the sealing body into the open rim.

Abstract: A non-aqueous electrolyte secondary battery is characterized by comprising an electrode body in which a positive electrode and a negative electrode face each other with a separator therebetween, and a battery case that accommodates the electrode body, wherein: the positive electrode has a positive electrode mixture layer containing a positive electrode active material; and when the non-aqueous electrolyte secondary battery is used in a fixed state, and the electrode body in the fixed state is bisected in the vertical direction, a dibutyl phthalate oil absorption amount of the positive electrode active material contained in the positive electrode mixture layer disposed in the top half region is higher than a dibutyl phthalate oil absorption amount of the positive electrode active material contained in the positive electrode mixture layer disposed in the bottom half region.

Abstract: A sealed battery including a battery case that includes a cylindrical exterior can having a bottom and an opening sealing body that closes an opening of the outer can; a gasket that is arranged between the exterior can and the opening sealing body; and an electrode body. The opening sealing body includes: a metal plate with an annular part to which an electrode lead is electrically connected, and a disconnecting part that is separated from the annular part when the inner pressure of the battery case exceeds a predetermined threshold; a valve body that is arranged further to the outside of the battery case than the metal plate; and an insulating plate that is arranged between the metal plate and the valve body. The insulating plate or the gasket is provided with an elastic deformation part that deforms in the direction of the valve body.

Abstract: A non-aqueous electrolyte secondary battery according to an aspect of the present disclosure comprises: an electrode body obtained by winding a positive electrode and a negative electrode with a separator therebetween; an electrolytic solution; and an exterior body that houses the electrode body and the electrolytic solution. The negative electrode has: a negative electrode current collector; and a negative electrode mixture layer formed on the surface of the negative electrode current collector, wherein the negative electrode mixture layer contains a negative electrode active material and fibrous carbon, and the average fiber length of the fibrous carbon contained in the central part of the negative electrode mixture layer in the width direction is greater than the average fiber length of the fibrous carbon contained in both end parts of the negative electrode mixture layer in the width direction.

Abstract: The present invention provides a cylindrical battery in which the opening end of an outer can has a different polarity from a sealing body and is easily connectable to an external lead. A cylindrical battery that is one embodiment described in the present disclosure comprises: an electrode body that includes a positive electrode and a negative electrode; a bottomed cylindrical outer can that houses the electrode body and is connected to one of the positive electrode and the negative electrode; and a sealing body that is connected to the other of the positive electrode and the negative electrode. The outer can has a protrusion formed by the side surface thereof protruding radially inward, and an opening end extends radially outward. The sealing body is fixed by crimping radially inward of the protrusion with a gasket interposed therebetween.

Abstract: A water-based binder for a non-aqueous electrolyte secondary battery. A binder for a non-aqueous electrolyte secondary battery electrode, includes a crosslinked polymer having a carboxyl group or a salt thereof, and the crosslinked polymer includes a structural unit derived from an ethylenically unsaturated carboxylic acid monomer; and a structural unit derived from a macromonomer including at least one compositional monomer selected from compounds represented by following formula (1): [C1] H2C?CR1—X??formula (1) wherein in formula (1), R1 represents a hydrogen or a methyl group; X represents C(?O)OR2 or CN; and R2 represents a straight chain or branched C1-C8 alkyl group or a C3-C8 alkyl group having an alicyclic structure.