POWER STORAGE DEVICE

摘要

A power storage device includes an electrode assembly, a case that houses the electrode assembly, and an insulating sheet, which insulates the electrode assembly and the case from each other. The electrode assembly has a first end face, which is orthogonal to the stacking direction, two primary faces, which are located on both sides in the stacking direction, and a tab, which extends on the first end face in the direction orthogonal to the stacking direction. The insulating sheet has a folded box shape, and further has two primary face covering portions, which respectively cover the primary faces of the electrode assembly, and non-primary-face covering portions, which cover the first end face of the electrode assembly and faces other than the primary faces thereof and are continuous with the primary face covering portions. The non-primary face covering portions overlap at least partially with each other.

主权项

1. A power storage device comprising:
an electrode assembly with a layered structure in which a positive electrode and a negative electrode are stacked, the electrode assembly being configured to have a first end face parallel with a stacking direction, two primary faces located on both sides in the stacking direction, and a tab extending from the first end face in a direction orthogonal to the stacking direction; a case configured to house the electrode assembly; and an insulating sheet configured to insulate the electrode assembly from the case, wherein the insulating sheet is shaped like a folded box, has two primary-face covering portions that cover the primary faces of the electrode assembly, and has non-primary-face covering portions that cover the first end face of the electrode assembly and faces other than the primary faces and are continuous with the primary-face covering portions, the non-primary-face covering portions overlap each other at least partially, the non-primary-face covering portions include a bottom-face covering portion that covers a second end face, which is an end face opposite to the first end face of the electrode assembly, and two side-face covering portions that cover both side faces, which are two end faces orthogonal to the primary faces, and the second end face, in the insulating sheet in a spread state, the bottom-face covering portion is continuous with the primary-face covering portions and provided between the primary-face covering portions, in the insulating sheet in the spread state, the primary-face covering portions and the bottom-face covering portion constitute a rectangular base portion as a whole, in the insulating sheet in the spread state, the side-face covering portions extend along sides of the base portion, the insulating sheet is folded along each of boundary lines between the primary-face covering portions and the bottom-face covering portion and boundary lines between the base portion and the side-face covering portions to form a box, and given that a length of the electrode assembly in the stacking direction is D and an extending length of the side-face covering portions from the base portion is W, the length D and the length W are set to satisfy a relationship of D/2