Toyota Jidosha Kabushiki Kaisha

Prime Planet Energy & Solutions, Inc.

Yukio Harima

Hiroya Umeyama

Tomohiro Matsuura

Kiyomi Kozuki

Yasushi Hirakawa

Hiroshi Takamatsu

Hiroaki Imanishi

Ichiro Murata

Ryoichi Wakimoto

A technology is provided which suppresses the movement of an electrode body inside of a battery case, and prevents the damage at a junction between an electrode tab group and a collector. A secondary battery herein disclosed includes an exterior body, a sealing plate, an electrode body, an electrode tab group, a terminal, and a collector. The collector has a first region part to be joined with the electrode tab group, a second region part to be joined with the terminal, and a third region part closer to the electrode body than the first region part.

Secondary battery

Provided is a nonaqueous electrolyte secondary battery that can be produced with high yield, through suppression of breakage of electrode collector portions during production and through suppression of damage to an electrode body during welding. The nonaqueous electrolyte secondary battery disclosed herein is provided with: an electrode body in which a plurality of electrodes are stacked; and a nonaqueous electrolyte. Each electrode has a collector and an active material layer formed on the collector. Each electrode has a collector portion being an active material layer non-forming portion. The collector portions of the electrodes are grouped and are clamped, in the stacking direction of the electrode body, by two or more members of an electrode collector terminal that is made up of the members. The collector portions of the electrodes and the members that clamp the collector portions are welded.

Nonaqueous electrolyte secondary battery and production method thereof

A sealed battery includes: a case main body that has an opening; and a sealing plate that closes off the opening, the sealing plate being joined to the case main body by a weld portion. The weld portion includes a weld bottom surface intersecting with the boundary surface of the case main body and the sealing plane, and the weld bottom surface being substantially orthogonal to the depth direction. A depth of the weld portion on a first virtual plane including the boundary surface, is greater than the depth of the weld portion on a second virtual plane including an outer surface of the case main body, the outer surface being opposite side from the boundary surface in the thickness direction of the case main body.

Sealed battery and a method for manufacturing the same

Provided is a secondary battery in which a battery lid is fixed to a battery case by inserting the battery lid into an opening of the battery case having the opening, and emitting laser beams to a butting portion between the battery case and the battery lid to perform butt welding, wherein, when a battery lid-side welding mark formed in the battery lid has a distance from a surface of the battery lid to a lower end of the battery lid-side welding mark which is defined as a battery lid-side welding depth, and a battery case-side welding mark formed in the battery case has a distance from the surface of the battery lid to a lower end of the battery case-side welding mark which is defined as a battery case-side welding depth, the battery lid-side welding depth is deeper than the battery case-side welding depth.

Growing community of inventors

Hirakata, Japan

Yukio Harima