Gs Yuasa International Ltd.

Shun Ito

Noriyoshi Munenaga

Isao Suzuki

Hiroshi Tasai

Taku Nakamura

An energy storage device includes: a positive electrode terminal, a negative electrode terminal, an electrode assembly, a positive current collector and a negative current collector which respectively connect the positive electrode terminal and the negative electrode terminal to the electrode assembly. The positive current collector includes: a first connecting portion which is connected with the positive electrode terminal, and a second connecting portion which is connected with the electrode assembly and the first connecting portion. The first connecting portion includes: a base portion which is connected to the second connecting portion, and an attachment portion which is provided to protrude from the base portion in a direction which is opposite to a direction toward the positive electrode terminal. In the attachment portion, a through hole through which a shaft portion of the positive electrode terminal is inserted is formed.

Energy storage device

An energy storage device includes: a conductive member (shaft portion) which penetrates a case and is connected to a terminal main body (bus bar connecting portion. The case includes: a through hole through which the conductive member penetrates; a concave portion which is at least a portion of a periphery of the through hole and is formed on one of an inner surface and an outer surface of the case, and a convex portion which is formed at a position opposite to the concave portion on an other of the inner surface and the outer surface of the case. In a plan view of the outer surface of the case, the terminal main body has a shape such that at least a portion of the terminal main body is larger than the concave portion.

Energy storage device and method for manufacturing the energy storage device

An energy storage device includes: a positive electrode terminal, a negative electrode terminal and an upper insulating member disposed between the positive electrode terminal or the negative electrode terminal and a lid body of the case. The positive electrode terminal includes, at a periphery of a first terminal body portion, a chamfered edge of which an edge is chamfered. The upper insulating member includes a peripheral wall which extends along the periphery of the first terminal body portion. The peripheral wall includes a chamfered corner of which a corner is chamfered, the chamfered corner facing the chamfered edge. A rib is formed on a chamfered inner side surface of the chamfered corner.

An energy storage device includes: an electrode assembly; a positive electrode current collector and a negative electrode current collector connected to the electrode assembly; and a container configured to house the electrode assembly and the positive electrode current collector and the negative electrode current collector, wherein the container has recessed portions, a connecting portion of the positive electrode current collector and a connecting portion of the negative electrode current collector respectively connected to the electrode assembly are housed in the recessed portions, respectively, the electrode assembly has a tab portion which includes a connecting portion connected to the positive electrode current collector and a tab portion which includes a connecting portion connected to the negative electrode current collector, and the tab portions have a bent portion respectively.

An energy storage device includes: a casinghaving an opening; an energy storage elementhoused in the casing; a lid platemounted in the opening of the casing; a positive electrode terminal memberand a negative electrode terminal memberintegrally fixed to the lid platein an insulation state by an insulating synthetic resin; a positive electrode current collectorP configured to electrically connect the energy storage elementand the positive electrode terminal memberto each other; and a negative electrode current collectorN configured to electrically connect the energy storage elementand the negative electrode terminal memberto each other, wherein an easy-to-break portionis formed on at least either one of the positive electrode terminal memberor the positive electrode current collectorP.

Disclosed is a method for manufacturing a cell which includes: a first step of manufacturing a core using a core manufacturing apparatus, the apparatus including a pair of winding shafts disposed with a rotation center of the apparatus interposed therebetween, the pair of winding shafts orbitally moving about the rotation center; and a second step of fabricating a laminated electrode member with a sheet-shaped positive electrode, a sheet-shaped negative electrode and a pair of sheet-shaped separators interposed thereto to be arranged alternately with the electrodes; and winding the laminated electrode member around a circumferential surface of the core. The first step includes: inserting a sheet having a higher strength than the separators between the winding shafts; orbitally moving the pair of winding shafts; and adhesively bonding or melt-bonding overlapped portions of the sheet at the winding shafts.

Growing community of inventors

Kyoto, Japan

Shun Ito