Vehicle Energy Japan Inc.

Hitachi Automotive Systems, Ltd.

Hitoshi Nishimori

Wataru Sato

Shigeki Makino

Hirofumi Takahashi

Masanari Oda

Tadashi Yoshida

Osamu Kubota

Akihide Tanaka

Masaaki Iwasa

Takayuki Nakajima

Jun Oya

Provided is a battery pack including: a first battery group in which a plurality of storage batteries having a battery can side surface and a battery can bottom surface linked to the battery can side surface are laminated so that the battery can side surfaces face each other; a second battery group in which a plurality of storage batteries having a battery can side surface and a battery can bottom surface linked to the battery can side surface are laminated so that the battery can side surfaces are face each other; and a case housing the first battery group and the second battery group, wherein the facing surfaces of the first battery group and the second battery group are directly or indirectly thermally connected to each other.

Battery pack

Provided is a battery pack capable of improving load resistance of a reinforcing part and protecting battery cells inside a case. The battery packincludes a reinforcing partthat is in contact with a bottom wallof the case. The reinforcing partextends in one direction Dalong the bottom wall, and has dimensions d, din directions orthogonal to the one direction Dthat are larger than thickness t of side wallsof the caseand of the bottom wall. The reinforcing parthas a pair of end fixed partsthat are fixed to both ends of the battery modulein the one direction D, and an intermediate fixed partbetween the pair of end fixed partsand fixed to the battery moduleor the case

A secondary battery module incudes a secondary battery, a secondary battery laminate, a busbar, and one pair of lashing plates. The one pair of lashing plates is provided on either end of the secondary battery laminate in a laminating direction. The one pair of lashing plates is connected via a cell block provided so as to face the narrow surface of the secondary battery. The secondary battery laminate is lashed in a state of being pressed in the laminating direction.

Battery module

An assembled cell is formed by laminating a plurality of rectangular secondary batteries in a thickness direction and interposing a spacer between the rectangular secondary batteries. The rectangular secondary battery includes an electrode group in which positive and negative electrodes are wound, and the electrode group is housed in the battery container formed in a flat box shape. The spacer includes a contact part which contacts with a width direction end region of a wide side surface of the battery container, a facing part which faces a width direction intermediate region of the wide side surface, and an inclined surface which is adjacent to both ends of the facing part in a width direction of the wide side surface. The inclined surface is inclined such that a thickness of the spacer becomes asymptotically smaller in a direction toward the width direction intermediate region from the width direction end region.

Assembled cell

Provided is a secondary cell which is resistant to vibration and impact. The secondary cell includes a flat wound group supported, through an insulator, at a lid on which external terminals are arranged, and a cell case for housing the flat wound group. In the secondary cell, a flat portion of the flat wound group has a gap between the flat portion and a wide surface of the cell case, and is held on the wide surface near a cell case bottom through a holding portion.

Growing community of inventors

Hitachinaka, Japan

Hitoshi Nishimori