Disclosed is a secondary battery in which a positive electrode active material non-covered portion is joined to a positive electrode current collector plate at one end portion of an electrode winding body, a negative electrode active material non-covered portion is joined to a negative electrode current collector plate at the other end portion of the electrode winding body, the positive electrode current collector plate has a positive electrode bead on a surface thereof, the negative electrode current collector plate has a negative electrode bead on a surface thereof, a width of the positive electrode bead is 0.05 mm or more and 0.18 mm or less, a width of the negative electrode bead is 0.03 mm or more and 0.12 mm or less.

Disclosed is a secondary battery in which a positive electrode active material non-covered portion is joined to a positive electrode current collector plate at one end portion of an electrode winding body, a negative electrode active material non-covered portion is joined to a negative electrode current collector plate at the other end portion of the electrode winding body, the positive electrode current collector plate has a positive electrode bead on a surface thereof, the negative electrode current collector plate has a negative electrode bead on a surface thereof, a width of the positive electrode bead is 0.05 mm or more and 0.18 mm or less, a width of the negative electrode bead is 0.03 mm or more and 0.12 mm or less.

A technique for suppressing formation of a black region in a wound electrode body is provided. A method for fabricating a nonaqueous electrolyte secondary battery disclosed here includes: an assembly step of constructing a secondary battery assembly including a wound electrode body; and an initial charging step of performing initial charging on the secondary battery assembly. In the initial charging step, the secondary battery assembly is charged at a first charging rate until a negative electrode potential with respect to a lithium metal reference (vs. Li/Li+) of the secondary battery assembly reaches at least 0.5 V, and a remaining gas amount of the wound electrode body at the end of the initial charging step is 58 cc or less.

A technique for suppressing formation of a black region in a wound electrode body is provided. A method for fabricating a nonaqueous electrolyte secondary battery disclosed here includes: an assembly step of constructing a secondary battery assembly including a wound electrode body; and an initial charging step of performing initial charging on the secondary battery assembly. In the initial charging step, the secondary battery assembly is charged at a first charging rate until a negative electrode potential with respect to a lithium metal reference (vs. Li/Li+) of the secondary battery assembly reaches at least 0.5 V, and a remaining gas amount of the wound electrode body at the end of the initial charging step is 58 cc or less.

The present disclosure provides a negative electrode sheet, a preparation method thereof and a lithium ion battery containing the same. The negative electrode sheet includes a negative electrode current collector, where the negative electrode current collector includes a single-sided coating area and a double-sided coating area; in the double-sided coating area, second coating layers are disposed on both side surfaces of the negative electrode current collector, respectively, wherein each of the second coating layers includes a first negative electrode active material layer and a second negative electrode active material layer, the second negative electrode active material layer is disposed on a surface of the negative electrode current collector, and the first negative electrode active material layer is disposed on a surface of the second negative electrode active material layer.

A non-aqueous electrolyte secondary battery includes: an electrode assembly including a positive and negative electrode plate; a rectangular outer casing having an opening; a sealing plate; an electrode terminal on the sealing plate; a first current collector connected to the electrode terminal; an insulation member; a second current collector connected to the first current collector; and a tab group extending from the electrode assembly toward the side wall and connected to the second current collector. The second current collector is a flat plate including a surface parallel to the side wall. The tab group is connected to the second current collector, and is bent at a connection portion with the second current collector such that the bent tab group extends parallel to the side wall. The second current collector is positioned on the first current collector by a guide portion extending from the insulation member.

A non-aqueous electrolyte secondary battery includes: an electrode assembly including a positive and negative electrode plate; a rectangular outer casing having an opening; a sealing plate; an electrode terminal on the sealing plate; a first current collector connected to the electrode terminal; an insulation member; a second current collector connected to the first current collector; and a tab group extending from the electrode assembly toward the side wall and connected to the second current collector. The second current collector is a flat plate including a surface parallel to the side wall. The tab group is connected to the second current collector, and is bent at a connection portion with the second current collector such that the bent tab group extends parallel to the side wall. The second current collector is positioned on the first current collector by a guide portion extending from the insulation member.

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.

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.

A secondary battery includes a battery device, a container member, a cover member, and an electrode terminal. The battery device includes a positive electrode and a negative electrode. The container member contains the battery device inside. The cover member is welded to the container member. The electrode terminal is provided in the cover member. The cover member includes a recessed part formed by the cover member bending to protrude in part toward the inside of the container member. The electrode terminal is disposed inside the recessed part.