Abstract: A non-aqueous electrolyte secondary battery includes a wound electrode body in which a first and a second separator, and a negative and a positive electrode body are stacked and wound. The wound electrode body has two R portions and is positioned in a flat portion. In a cross section orthogonal to a winding axis, when a distance from a bending end straight line to the winding starting end of the negative electrode body in a reference direction is denoted by A, a distance from the bending end straight line to the winding starting end of the positive electrode body in the reference direction is denoted by B, and X represents a distance from the bending end straight line to the winding end of the negative electrode body in the reference direction in the cross section is denoted by X, A, B, and X satisfy Condition: A<B<X.

Abstract: A non-aqueous electrolyte secondary battery includes a wound electrode body in which a first and a second separator, and a negative and a positive electrode body are stacked and wound. The wound electrode body has two R portions and is positioned in a flat portion. In a cross section orthogonal to a winding axis, when a distance from a bending end straight line to the winding starting end of the negative electrode body in a reference direction is denoted by A, a distance from the bending end straight line to the winding starting end of the positive electrode body in the reference direction is denoted by B, and X represents a distance from the bending end straight line to the winding end of the negative electrode body in the reference direction in the cross section is denoted by X, A, B, and X satisfy Condition: A<B<X.

Abstract: A nonaqueous electrolyte secondary battery includes: a flat wound electrode body in which an elongated positive electrode, an elongated negative electrode, and an elongated separator (70) which electrically separates the positive electrode and the negative electrode from each other overlap each other and are wound in a longitudinal direction; and a nonaqueous electrolyte. The separator (70) includes a substrate layer (90) which is formed of a resin substrate and a heat resistance layer (80) which is formed on one surface of the substrate layer (90), and an adhesion strength between the substrate layer (90) and the heat resistance layer (80) is 0.19 N/10 mm to 400 N/10 mm.

Abstract: A flat electrode body of a battery has a first-side curved end positioned on a first side of an electrode body width direction and a second-side curved end positioned on a second side. A positive electrode innermost curved portion of a positive electrode sheet is disposed inside the first-side curved end. When the dimension from a positive electrode connecting portion to the end on the first side of the electrode body is defined as a distance and the dimension from the positive electrode connecting portion to the end on the second side of the electrode body is defined as a distance, the positive electrode connecting portion being in the positive electrode protrusion wound portion and connected to a terminal connecting portion of a positive terminal member, the terminal connecting portion is connected to the positive electrode connecting portion at a position satisfying the condition Ha?1.1Hb.

Abstract: The present invention provides a lithium secondary battery having a positive electrode provided with a positive electrode active material formed of a lithium-manganese complex oxide represented by the general formula Lix(MnaCobNic)2?x?yMyO2??(1) (where, a, b, and c are 0<a<0.65, 0?b, and 0?c, and x and y are 0<x<1.3 and 0<y<0.05), with the element M being an element that has a larger bond energy with oxygen than Mn, Co, or Ni.

Abstract: A flat electrode body of a battery has a first-side curved end positioned on a first side of an electrode body width direction and a second-side curved end positioned on a second side. A positive electrode innermost curved portion of a positive electrode sheet is disposed inside the first-side curved end. When the dimension from a positive electrode connecting portion to the end on the first side of the electrode body is defined as a distance and the dimension from the positive electrode connecting portion to the end on the second side of the electrode body is defined as a distance, the positive electrode connecting portion being in the positive electrode protrusion wound portion and connected to a terminal connecting portion of a positive terminal member, the terminal connecting portion is connected to the positive electrode connecting portion at a position satisfying the condition Ha?1.1Hb.

Abstract: The present invention provides a lithium secondary battery having a positive electrode provided with a positive electrode active material formed of a lithium-manganese complex oxide represented by the general formula Lix(MnaCobNic)2-x-yMyO2??(1) (where, a, b, and c are 0<a<0.65, 0?b, and 0?c, and x and y are 0<x<1.3 and 0<y<0.05), with the element M being an element that has a larger bond energy with oxygen than Mn, Co, or Ni.