Hitachi Automotive Systems, Ltd.

Hitachi Vehicle Energy, Ltd.

Sho Saimaru

Takuro Tsunaki

Kinya Aota

Kouichi Kajiwara

Naoki Kimura

Keisuke Sawada

Fujio Hirano

Takenori Ishizu

Yutaka Sato

Mitsuru Koseki

Kiyoyuki Sekine

Ryuji Kono

Hideyuki Shibanuma

Hidemasa Kawai

Kazuaki Urano

Masaaki Iwasa

Sho Matsumoto

Ryuji Kohno

Takashi Sasaki

A square secondary battery includes a generating element having an electrode; a battery can holding the generating element; a battery lid that seals an opening of the battery can; an external terminal arranged on the battery lid; and a current collector connecting the electrode of the generating element to the external terminal. The external terminal has a bus bar joint to which a bus bar is connected and a current collector joint to which the current collector is connected, the bus bar joint and the current collector joint being integrally juxtaposed on the battery lid. The current collector joint has a cylindrical insertion part to be inserted into a through hole in the battery lid and also has a sealing part arranged at an outer periphery of the insertion part, the sealing part pressing down a sealing member.

Square secondary battery

An electric storage device includes a container which houses an electric generating element, and a sealing plug which seals a liquid injecting hole into which an electrolyte is injected. The liquid injecting hole is provided in a bottom surface of a recessed portion provided to be recessed on one side surface of the container. The sealing plug includes an inserting portion to be inserted into the liquid injecting hole and a fitting portion to be fitted into the recessed portion. At least either a rim portion of the fitting portion or an opening rim portion of the recessed portion is provided with a plurality of plastic deformation portions. In each of n regions (n is an integer of at least 3) into which an outer circumference of the fitting portion or an inner circumference of the recessed portion is equally divided, one or more of the plastic deformation portion(s) is/are arranged, and, in each of regions into which the outer circumference of the fitting portion or the inner circumference of the recessed portion is halved with an arbitrary plastic deformation portion out of the plastic deformation portions set as a starting point, one or more of the plastic deformation portion(s) is/are arranged. An outer circumferential side surface of the fitting portion and an inner circumferential side surface of the recessed portion are welded over an entire circumference.

Electric storage device and method for manufacturing electric storage device

An electrical storage element includes a power generation element that includes an electrode, a can in which the power generation element is stored, a lid that seals an opening of the can, an external terminal that is disposed on the lid, and a current collector that connects the electrode of the power generation element, and the external terminal. The external terminal includes a bus bar welding portion having a bus bar welding surface to which a bus bar is welded, and a current collector connection portion having a caulking-jig abutting surface, the current collector connection portion includes an insertion portion which is inserted into a through-hole of the lid and has a tip end which is fixed to the current collector by caulking, the bus bar welding portion and the current collector connection portion are integrally provided in parallel on the lid, and the jig abutting surface is extended from the bus bar welding surface in the same plane as the bus bar welding surface.

Electrical storage element

A secondary battery has: an electrode group which includes sheet-form positive and negative electrode plates each including a metallic foil having an active material applied onto both sides of the metallic foil, and a separator disposed between the positive and negative electrode plates, wherein the positive and negative electrode plates and the separator are spirally wound together around a winding core into a flattened shape, wherein the electrode group has, at the both ends thereof as viewed in the winding core direction, respectively formed metallic foil exposed portions of the positive and negative electrode plates onto which the active material is not applied; a battery container which contains the electrode group therein, wherein the battery container has a battery casing and a battery cap; and positive and negative external terminals electrically connected to the metallic foil exposed portions of the positive and negative electrode plates, respectively. Winding end portions in the metallic foil exposed portions of the positive and negative electrode plates are arranged opposite to the inner surface of the battery container through respective conducting members.

Secondary battery and method for producing the same

Battery

Growing community of inventors

Hitachinaka, Japan

Sho Saimaru