Non-aqueous electrolyte secondary battery and method for producing the same

A non-aqueous electrolyte secondary battery comprising:

• a spirally-wound electrode group including a continuous first electrode, a continuous second electrode, and a continuous separator interposed between the first electrode and the second electrode;
• and a non-aqueous electrolyte, wherein
• the first electrode includes a sheet-like first current collector, and a first active material layer formed on a surface of the first current collector;
• the second electrode includes a sheet-like second current collector, and a second active material layer formed on a surface of the second current collector;
• a winding terminal end of the first electrode faces the second electrode on the further outer peripheral side, with the separator interposed therebetween;
• a facing site of the second electrode where the second electrode faces the winding terminal end of the first electrode is reinforced with a reinforcing component for supplementing a thickness of the second electrode;
• and
• the reinforcing component is a thick portion where the thickness of the second current collector is partially increased.

A non-aqueous electrolyte secondary battery comprising:

• a spirally-wound electrode group including a continuous first electrode, a continuous second electrode, and a continuous separator interposed between the first electrode and the second electrode;
• and a non-aqueous electrolyte, wherein
• the first electrode includes a sheet-like first current collector, and a first active material layer formed on a surface of the first current collector;
• the second electrode includes a sheet-like second current collector, and a second active material layer formed on a surface of the second current collector;
• a winding terminal end of the first electrode faces the second electrode on the further outer peripheral side, with the separator interposed therebetween;
• a facing site of the second electrode where the second electrode faces the winding terminal end of the first electrode is reinforced with a reinforcing component for supplementing a thickness of the second electrode;
• the separator is arranged on the further outer peripheral side of the facing site;
• and
• the reinforcing component is provided on the outer peripheral side of the separator at the portion facing the facing site.

A method for producing a non-aqueous electrolyte secondary battery, the method comprising the steps of:

• (a) preparing a continuous first electrode including a sheet-like first current collector, and a first active material layer formed on a surface of the first current collector;
• (b) preparing a continuous second electrode including a sheet-like second current collector, and a second active material layer formed on a surface of the second current collector;
• and
• (c) spirally winding the first electrode and the second electrode, with a continuous separator interposed therebetween, thereby to form an electrode group, wherein
• the first electrode and the second electrode are wound such that a winding terminal end of the first electrode faces the second electrode on the further outer peripheral side, with the separator interposed therebetween,
• a facing site of the second electrode where the second electrode faces the winding terminal end of the first electrode is reinforced in advance with a reinforcing component for supplementing a thickness of the second electrode,
• the facing site is an active-material-layer-formed portion where the second active material layer is formed at least on the outer peripheral side, and
• the active-material-layer-formed portion is present between the active-material-layer-free portions where the second active material layer is not formed at least on the outer peripheral side, and the second active material layer formed on the outer peripheral side of the active-material-layer-formed portion comprises the reinforcing component.

A method for producing a non-aqueous electrolyte secondary battery, the method comprising the steps of:

• (a) preparing a continuous first electrode including a sheet-like first current collector, and a first active material layer formed on a surface of the first current collector;
• (b) preparing a continuous second electrode including a sheet-like second current collector, and a second active material layer formed on a surface of the second current collector;
• and
• (c) spirally winding the first electrode and the second electrode, with a continuous separator interposed therebetween, thereby to form an electrode group, wherein the first electrode and the second electrode are wound such that a winding terminal end of the first electrode faces the second electrode on the further outer peripheral side, with the separator interposed therebetween,
• a facing site of the second electrode where the second electrode faces the winding terminal end of the first electrode is reinforced in advance with a reinforcing component for supplementing a thickness of the second electrode, and
• the reinforcing component is a thick portion where the thickness of the second current collector is partially increased.

A method for producing a non-aqueous electrolyte secondary battery, the method comprising the steps of:

• (a) preparing a continuous first electrode including a sheet-like first current collector, and a first active material layer formed on a surface of the first current collector;
• (b) preparing a continuous second electrode including a sheet-like second current collector, and a second active material layer formed on a surface of the second current collector;
• and
• (c) spirally winding the first electrode and the second electrode, with a continuous separator interposed therebetween, thereby to form an electrode group, wherein
• the first electrode and the second electrode are wound such that a winding terminal end of the first electrode faces the second electrode on the further outer peripheral side, with the separator interposed therebetween,
• a facing site of the second electrode where the second electrode faces the winding terminal end of the first electrode is reinforced in advance with a reinforcing component for supplementing a thickness of the second electrode,
• the separator is arranged on the further outer peripheral side of the facing site, and
• the reinforcing component is provided on the outer peripheral side of the separator at the portion corresponding to the facing site.