NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Provided is a nonaqueous electrolyte secondary battery including a bottomed cylindrical positive electrode casing, and a negative electrode casing which is fixed to an opening of the positive electrode casing through a gasket. The opening of the positive electrode casing is caulked to the negative electrode casing side to seal an accommodation space. A caulking tip end in the opening of the positive electrode casing is disposed in an inward direction of the negative electrode casing than a tip end of the negative electrode casing. A diameter d of the nonaqueous electrolyte secondary battery is in a range of 4 mm to 12 mm, a height h1 of the nonaqueous electrolyte secondary battery is in a range of 1 mm to 3 mm, a side surface portion of the positive electrode casing is formed in a curved surface shape, a radius of curvature R is set in a range of 0.8 mm to 1.1 mm, and a height h2 of the positive electrode casing is in a range of 65% to 90% with respect to the height h1 of the nonaqueous electrolyte secondary battery.

主权项

1. A nonaqueous electrolyte secondary battery, comprising:
a bottomed cylindrical positive electrode casing; and a negative electrode casing which is fixed to an opening of the positive electrode casing through a gasket, and forms an accommodation space between the positive electrode casing and the negative electrode casing, wherein the opening of the positive electrode casing is caulked to the negative electrode casing side to seal the accommodation space, the caulking is performed in such a manner that a caulking tip end in the opening of the positive electrode casing is disposed in an inward direction of the negative electrode casing than a tip end of the negative electrode casing, and a diameter d of the nonaqueous electrolyte secondary battery is in a range of 4 mm to 12 mm, a height h1 of the nonaqueous electrolyte secondary battery is in a range of 1 mm to 3 mm, at least a part of a side surface portion of the positive electrode casing on an opening side is formed in a curved surface shape, a radius of curvature R of the curved surface is set in a range of 0.8 mm to 1.1 mm, and a height h2 of the positive electrode casing is in a range of 65% to 90% with respect to the height h1 of the nonaqueous electrolyte secondary battery.