Prime Planet Energy & Solutions, Inc.

Takashi Hosokawa

Tomoyuki Yamada

Ryoichi Wakimoto

Kodai Shintani

Kazuya Ikeshita

Yu Matsui

Masato Ota

Tatsuya Tsushima

Shota Yanase

The herein disclosed nonaqueous electrolyte secondary battery includes an electrode assembly in which a positive electrode including positive electrode active layers, a negative electrode including negative electrode active layers, and a separator are provided. The negative electrode active material layer includes a first area between an end side and a position 5 mm away from the end side in the width direction. An end part of the positive electrode is opposed to at least a part of the first area. A thickness Tat a central part of the positive electrode and a thickness Tat the end part of the positive electrode satisfy 0.95<T/T<1.05. Regarding the negative electrode active material layer, a basis weight Mat a central part of the negative electrode and a basis weight Mof an area opposed to the positive electrode active material layer of the first area satisfy 0.95<M/M

Nonaqueous electrolyte secondary battery

Disclosed here is a battery including: an exterior body having a bottom wall; and a winding electrode body in which positive electrode, negative electrode and separator are wound about a winding axis. The winding electrode body has a flat shape having a pair of curvature parts having a curved outside surface and a flat part that connects the pair of curvature parts to each other and has a flat outside surface. When a line perpendicular to the winding axis of the winding electrode body and perpendicular to the bottom wall of the exterior body is assumed as L1, a portion positioned at an outermost periphery of the negative electrode in at least one of the pair of the curvature parts faces a portion positioned on a winding inner peripheral side of the negative electrode via the separator and not via the positive electrode on the line L1.

Battery and manufacturing method therefor

A battery disclosed herein includes: an exterior body including a bottom wall and an opening facing the bottom wall; a sealing plate sealing the opening of the exterior body; and one or a plurality of wound electrode bodies, in which a band-shaped positive electrode including a positive electrode active material layer and a band-shaped negative electrode including a negative electrode active material layer are laminated via a band-shaped separator and are wound around a winding axis. A length of the positive electrode active material layer is 15 cm or more in a winding axis direction of the wound electrode body. A plurality of winding stop tapes are attached to an outer surface of the wound electrode body at intervals in the winding axis direction.

Battery with separately arranged winding stop tapes

The battery disclosed here comprises one or more wound electrode bodies each composed of a strip-shaped first electrode plate and a strip-shaped second electrode plate superimposed and wound together with a strip-shaped separator between the two, and a battery case containing the wound electrode body or bodies. The first electrode plate has multiple electrode tabs protruding from an edge extending in the longitudinal direction, and the multiple electrode tabs include a first electrode tab having a straight part that is roughly perpendicular to the edge and has a length of at least 2 mm in the direction orthogonal to the edge, and second electrode tabs lacking the straight part.

Growing community of inventors

Hyogo-ken, Japan

Takashi Hosokawa