Patent ID: 11962026
Assignee: SANYO ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 7:
8. A power supply device, comprising:
a plurality of secondary battery cells each including an exterior can having a quadrangular shape and a sealing plate closing an otherwise open end of the exterior can, the plurality of secondary battery cells including a first secondary battery cell and a second secondary battery cell adjacent to the first secondary battery cell, the plurality of secondary battery cells forming a battery stack;
a separator having insulating properties and interposed between the first secondary battery cell and the second secondary battery cell;
one pair of end plates covering both end faces of the battery stack; and
a plurality of fastening members fastening the one pair of end plates together,
wherein,
the separator has a main face including a flat face, a first protruding face, and a second protruding face, each configured to face the first secondary battery cell,
each of the first protruding face and the second protruding face is nearer to the first secondary battery cell than the flat face in a stacking direction of the battery stack,
the flat face has a first region and a second region both facing an upper peripheral portion of the first secondary battery cell which is adjacent to the otherwise open end closed with the sealing plate of the first secondary battery cell,
the first protruding face is positioned between the first region and the second region,
the flat face further has a third region and a fourth region both facing a lower peripheral portion of the first secondary battery cell which is adjacent to a bottom end opposite the otherwise open end closed with the sealing plate of the first secondary battery cell,
the second protruding face is positioned between the third region and the fourth region,
an uppermost peripheral edge of the first protruding face is offset from an uppermost surface of the first secondary battery cell where the sealing plate thereof is located,
a lowermost peripheral edge of the second protruding face is offset from a lowermost surface opposite the uppermost surface of the first secondary battery cell, and
the first protruding face and the second protruding face are not connected with each other in a height direction of the first secondary battery cell via another protruding portion of the separator.