Abstract: Provided is power supply device configured for safe discharge to the outside of the power supply device even when gas at high temperature and under high pressure is discharged from a secondary battery cell, power supply device including: a plurality of secondary battery cells each having gas discharge valve for discharging internal gas; and cover part disposed on one surface of battery stack with the plurality of secondary battery cells stacked while covering gas discharge valve of each of the plurality of secondary battery cells. Cover part is provided inside with a gas guide path partitioned to discharge gas discharged from gas discharge valve to the outside of cover part, and the gas guide path includes one or more horizontal gas flow bending portions that bend at least a flow direction of some of the gas in plan view of cover part.

Abstract: A battery module includes a housing, battery cells disposed within the housing, and a wedge apparatus disposed within the housing and configured to exert a substantially constant force on the battery cells. The wedge apparatus includes a first wedge having a first thick end tapering to a first thin end, and a second wedge having a second thick end tapering to a second thin end, the first wedge and the second wedge positioned such that the first wedge and the second wedge at least partially overlap. The wedge apparatus further includes a tensioning mechanism disposed at least partially in the first opening and the second opening and configured to move the first wedge in a first direction relative to the second wedge causing a width of the wedge apparatus to expand and exert a first force on the plurality of battery cells.

Abstract: The present invention provides a positive electrode active material for a non-aqueous electrolyte secondary battery including a lithium metal composite oxide powder represented by a general formula: LizNi1?x?yCoxMyO2+?, wherein 0<x?0.35, 0?y?0.35, 0.95?z?1.30, ?0.15???0.15, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti and Al; and a coating layer placed on particle surfaces of the lithium metal composite oxide powder; wherein the coating layer is a mixed-phase of a crystalline phase and an amorphous phase.

Abstract: An anode active material for a secondary battery, which has improved cycle swelling properties and rapid charge performance, an anode comprising an anode active material for a secondary battery, and a method for manufacturing same. The anode active material is a mixture of scaly natural graphite and spherical natural graphite. An average particle diameter (D50) of the scaly natural graphite is 10 ?m to 15 ?m and an average particle diameter (D50) of the spherical natural graphite is 14 ?m or less.

Abstract: A positive electrode active material includes a lithium transition metal oxide, in which a cobalt content in the lithium transition metal oxide is less than a manganese content, wherein at least one of nickel, cobalt, and manganese in the lithium transition metal oxide has a concentration gradient that gradually changes from a center of a particle to a surface thereof, the positive electrode active material is in the form of a secondary particle formed by agglomeration of primary particles, and a ratio in which angles between c-axis directions, which are measured at at least 8 points on a surface of the positive electrode active material by TEM analysis, and a growth direction of the particle at the measuring point satisfy 85° to 95° is 60% or more.

Abstract: A non-aqueous electrolyte secondary battery capable of suppressing an increase in man-hour for a compression process in the production of a negative electrode and also suppressing a deterioration in charge/discharge cycle characteristics is provided. A non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with a negative electrode having a negative electrode active material layer, wherein: the negative electrode active material layer includes graphite particles A and graphite particles B as a negative electrode active material; the internal porosity of the graphite particles A is 5% or less, and the internal porosity of the graphite particles B is 8-20%; and the mass ratio of the graphite particles A to the graphite particles B is 70:30 to 90:10.