Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery comprising:

• a separator having a first surface and a second surface;
• an electrode body in which a plurality of electrode sheets is laminated via the separator;
• a pair of electrode terminals electrically connected to the electrode body, and
• an inorganic particle-containing layer containing inorganic particles disposed on the first surface of the separator;
• wherein:
• each of the electrode sheets is a sheet-shaped electrode in which an electrode mixture layer is formed on a surface of a current collector foil, the each of the electrode sheets including a current collector foil exposed portion in which the current collector foil is exposed, the current collector foil exposed portion being formed in a corresponding one of side edge portions, in a width direction, of the each of the electrode sheets;
• the electrode body includes
• a core portion where the electrode mixture layers of the electrode sheets are laminated in a central part of the electrode body in the width direction,
• terminal connecting portions to which the electrode terminals are connected, respectively, the terminal connecting portions being formed in both side edge portions of the electrode body in the width direction such that respective current collector foil exposed portions are laminated, and
• a mixture layer non-facing portion formed in at least one of boundaries of the core portion with the terminal connecting portions, the mixture layer non-facing portion being configured such that the electrode mixture layer faces the current collector foil exposed portion;
• and
• a short-circuit promoting portion constituted by a recessed portion having a depth of 30% or more of a thickness of the separator is formed in the separator provided between the electrode sheets in the mixture layer non-facing portion.