Hitachi Vehicle Energy, Ltd.

Hitachi Automotive Systems, Ltd.

Yutaka Sato

Takuro Tsunaki

Mitsuru Koseki

Kinya Aota

Naoki Kimura

Kouichi Kajiwara

Fujio Hirano

Keisuke Sawada

Sho Saimaru

Takenori Ishizu

Kiyoyuki Sekine

Ryuji Kono

Hideyuki Shibanuma

Hidemasa Kawai

Ryuji Kohno

Takashi Sasaki

A secondary battery includes a battery casing accommodating an electricity-generating element group, and a battery cover having through-holes and sealing an opening in the battery casing. A first face at one end of each of positive and negative electrode connecting plates, which are each formed from a single plate of metal, is connected to a non-coated section of the electricity-generating element group. A second face at the other end of each of the positive and negative electrode connecting plates is a face onto which a busbar is welded, and the second face is exposed outward from one of the through-holes. Insulating base materials are interposed between THE positive and negative electrode connecting plates and an outer circumference of each through-hole, the insulating base materials and the battery cover are connected by brazing, and the insulating base materials and the positive and negative electrode connecting plates are connected by brazing.

Secondary battery and secondary battery module

Terminal insulating membersA,B have inner side surfaces of a first support baseA facing each other, and an engaging recessesextending along a surface of a coverare formed in inner surfaces of both the terminal insulating members. An outer surface along a short side of the cover in a second support baseA is formed with an engaging recessextending along a cover surface. The engaging recessesandof both the terminal insulating members are arranged to face each other. Further, both the terminal insulating members are also provided with engaging recesseshaving a substantially circular cross-sectional shape on both side surfaces along a long side of the cover. The configuration can be used for positioning or fixing an accessory loaded into a secondary battery SB. As a result, a part only for loading an external part is unnecessary.

Secondary battery comprising terminal insulating members

A secondary battery includes a gas release valve located at a battery container housing a power generating element, wherein: the gas release valve includes a valve disk caused to expand outward by internal pressure in the battery container; wherein a plurality of grooves are formed at the valve disk in order that a plurality of valve element pieces become fractured along the grooves when the valve disk expands due to the internal pressure; and a scatter-deterring portion is formed at the valve disk in order to prevent the fractured valve element pieces along the grooves from scattering away from the valve disk.

Secondary battery with gas release valve

Battery

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Hitachinaka, Japan

Yutaka Sato