Sanyo Electric Co., Ltd.

Takeshi Nagane

Wataru Okada

Yasushi Hirakawa

Yusuke Fujii

Kosho Abe

Sho Ojima

A power supply device includes battery cells each having a rectangular external shape, a separator disposed between the battery cells, a pair of end plates that are disposed on respective ends of a battery assembly in which the separator and the battery cells are stacked, and a bind bar that binds the pair of end plates. The separator has insulating rib parts that protrude from both surfaces of the separator, and the insulating rib parts of the separator stacked on each surface of the battery cell are stacked on each other on a bottom surface of the battery cell. The insulating rib parts are stacked on each other on the bottom surface of the battery cell by inserting an insertion rib provided in one of the stacked insulating rib parts into an insertion groove provided in the other of the stacked insulating rib parts.

Power supply device

A battery pack including a lightweight and high-rigidity end plate is provided. The battery pack includes: cell stacked body including a plurality of stacked rectangular cells; first end plate disposed at one end of cell stacked body in the stacking direction of rectangular cells; second end plate disposed at the other end of cell stacked body; and connection member connected to first end plate and second end plate. At least one of first end plate and second end plate includes first member made of a first metal material and second member made of a second metal material different from the first metal material. First member and second member are stacked in the stacking direction of rectangular cells. The rigidity of the second metal material is higher than that of the first metal material. The specific gravity of the first metal material is lower than that of the second metal material.

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Miyagi, Japan

Takeshi Nagane