US 12,244,028 B2
Power storage device
Taijyu Morishita, Kasai (JP); and Wataru Okada, Kobe (JP)
Assigned to PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo (JP)
Filed by Prime Planet Energy & Solutions, Inc., Tokyo (JP)
Filed on Oct. 19, 2021, as Appl. No. 17/504,511.
Claims priority of application No. 2020-175797 (JP), filed on Oct. 20, 2020.
Prior Publication US 2022/0123405 A1, Apr. 21, 2022
Int. Cl. H01M 50/209 (2021.01); H01M 10/0525 (2010.01)
CPC H01M 50/209 (2021.01) [H01M 10/0525 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A power storage device, comprising:
a power storage module having a first direction and a second direction orthogonal to the first direction, the power storage module including a plurality of stacked power storage cells stacked along the first direction; and
a case having an inner space to accommodate the power storage module, the inner space having a width extending along the second direction,
wherein
the case includes
a main body provided with an opening on an electrode terminal side of the plurality of power storage cells,
a cover provided over the opening,
a plurality of tapered portions that narrows the width of the inner space in a height direction from the opening toward a bottom surface of the main body; and
a non-tapered portion between two adjacent tapered portions among the plurality of tapered portions along the first direction,
a recess is formed in the bottom surface of the main body and has a closed outer side wall defined by the non-tapered portion,
each of the plurality of tapered portions is located at a position corresponding to a center of a corresponding power storage cell of the plurality of stacked power storage cells in the first direction, and
the non-tapered portion straddles two adjacent power storage cells of the plurality of stacked power storage cells in the first direction.