Nonaqueous electrolyte secondary battery and method of manufacturing nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery comprising:

• an electrode group having a structure formed by folding a stack comprising a positive electrode, a negative electrode, and a separator not less than twice;
• a nonaqueous electrolyte with which said electrode group is impregnated;
• and
• a film jacket housing said electrode group and formed of a laminate film comprising a metal layer and a flexible synthetic resin layer formed on at least a portion of said metal layer,
• wherein a surface of said electrode group to which a stacked structure is exposed has a shape satisfying Formula (2) below in a charged state:
• 0.9≦L4/L3≦1.2 (2)
• wherein L4 is a thickness of a most multilayered portion in a region of the surface except folded-layer-regions and L3 is a thickness of an end portion which is one of end portions of the region except the folded-layer-regions and is equal in number of layers to L4.

A nonaqueous electrolyte secondary battery comprising:

• an electrode group having a structure formed by spirally winding a positive electrode and a negative electrode with a separator interposed therebetween and compressing a resultant coil in a direction of diameter;
• a nonaqueous electrolyte with which said electrode group is impregnated;
• and
• a film jacket housing said electrode group and formed of a laminate film comprising a metal layer and a flexible synthetic resin layer formed on at least a portion of said metal layer,
• wherein said positive electrode and said separator are adhered to each other by adhesive polymers that are dispersedly present in said positive electrode and said separator and in a boundary between said positive electrode and said separator, and said negative electrode and said separator are adhered to each other by adhesive polymers that are dispersedly present in said negative electrode and said separator and in a boundary between said negative electrode and said separator, and
• a surface of said electrode group to which a stacked structure is exposed has a shape satisfying Formula (1) below in a charged state:
• 0.9≦L2/L1≦1.2 (1)
• wherein L2 is a thickness of a most multilayered portion in a region of the surface except curved-layer-regions and L1 is a thickness of an end portion which is one of end portions of the region except the curved-layer-regions and is equal in number of layers to L2.

A nonaqueous electrolyte secondary battery comprising:

• an electrode group having a structure formed by folding a stack comprising a positive electrode, a negative electrode, and a separator not less than twice;
• a nonaqueous electrolyte with which said electrode group is impregnated;
• and
• a film jacket housing said electrode group and formed of a laminate film comprising a metal layer and a flexible synthetic resin layer formed on at least a portion of said metal layer,
• wherein said positive electrode and said separator are adhered to each other by adhesive polymers that are dispersedly present in said positive electrode and said separator and in a boundary between said positive electrode and said separator, and said negative electrode and said separator are adhered to each other by adhesive polymers that are dispersedly present in said negative electrode and said separator and in a boundary between said negative electrode and said separator, and
• a surface of said electrode group to which a stacked structure is exposed has a shape satisfying Formula (2) below in a charged state:
• 0.9≦L4/L3≦1.2 (2)
• wherein L4 is a thickness of a most multilayered portion in a region of the surface except folded-layer-regions and L3 is a thickness of an end portion which is one of end portions of the region except the folder-layer-regions and is equal in number of layers to L4.

A nonaqueous electrolyte secondary battery comprising:

• an electrode group having a structure formed by spirally winding a positive electrode and a negative electrode with a separator interposed therebetween and compressing a resultant coil in a direction of diameter;
• a nonaqueous electrolyte with which said electrode group is impregnated;
• and
• a film jacket housing said electrode group and formed of a laminate film comprising a metal layer and a flexible synthetic resin layer formed on at least a portion of said metal layer,
• wherein each of said positive electrode, said negative electrode and said separator contains an adhesive polymer, and
• a surface of said electrode group to which a stacked structure is exposed has a shape satisfying Formula (1) below in a charged state:
• 0.9≦L2/L1≦1.2 (1)
• where L2 is a thickness of a most multilayered portion in a region of the surface except curved-layer-regions and L1 is a thickness of an end portion which is one of end portions of the region except the curved-layer-regions and is equal in number of layers of L2.

A nonaqueous electrolyte secondary battery comprising:

• an electrode group having a structure formed by folding a stack comprising a positive electrode, a negative electrode and a separator not less than twice;
• a nonaqueous electrolyte with which said electrode group is impregnated;
• and
• a film jacket housing said electrode group and formed of a laminate film comprising a metal layer and a flexible synthetic resin layer formed on at least a portion of said metal layer,
• wherein each of said positive electrode, said negative electrode and said separator contains an adhesive polymer, and
• a surface of said electrode group to which a stacked structure is exposed has a shape satisfying Formula (2) below in a charged state:
• 0.9≦L4/L3≦1.2 (1)
• where L4 is a thickness of a most multilayered portion in a region of the surface except folded-layer-regions and L3 is a thickness of an end portion which is one of end portions of the region except the folded-layer-regions and is equal in number of layers of L4.