NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME

摘要

A nonaqueous electrolyte secondary battery includes an electrode body (20), a nonaqueous electrolytic solution, a battery case (80), and a bag-shaped film (10). The electrode body has a laminate structure in which a positive electrode (30) and a negative electrode (40) are laminated. The battery case accommodates the electrode body and the nonaqueous electrolytic solution. The bag-shaped film covers the electrode body to insulate the electrode body and an inner wall of the battery case from each other. An inner pressure of the battery case is adjusted to be 0.14 MPa to 0.23 MPa.

主权项

1. A nonaqueous electrolyte secondary battery comprising:
an electrode body having a laminate structure in which a positive electrode and a negative electrode are laminated; a nonaqueous electrolytic solution; a battery case that accommodates the electrode body and the nonaqueous electrolytic solution; and a bag-shaped film that covers the electrode body to insulate the electrode body and an inner wall of the battery case from each other, wherein an inner pressure of the battery case is adjusted to be 0.14 MPa to 0.23 MPa wherein the bag-shaped film has an opening that is positioned on an upper side of the battery case and is formed of one sheet-shaped insulating film, the insulating film has at least a bag bottom portion, a first wide side surface portion, a second wide side surface portion, a first narrow side surface portion, a second narrow side surface portion, a third narrow side surface portion, a fourth narrow side surface portion, and a movement blocking mechanism, the first wide side surface portion and the second wide side surface portion are folded centering on the bag bottom portion, the first narrow side surface portion and the second narrow side surface portion extend from the first wide side surface portion to the second wide side surface portion, the third narrow side surface portion and the fourth narrow side surface portion extend from the second wide side surface portion to the first wide side surface portion, the first narrow side surface portion and the second narrow side surface portion are joined to the third narrow side surface portion and the fourth narrow side surface portion, respectively, the movement blocking mechanism is surrounded by the bag bottom portion, the first narrow side surface portion, and the third narrow side surface portion in a state where the insulating film is unfolded as a sheet, and the movement blocking mechanism is configured to block at least a portion of a gap of the bag-shaped film through which an inside and an outside of the bag-shaped film are communicated with each other.