Patent ID: 9515301
Filing Date: 2016-12-06
CPC Classification: H01M,Y02E

Claim Text:
1. A coin battery comprising: a power generation element including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte; and a housing accommodating the power generation element, the housing comprising: a cylindrical battery case having a bottom, and a first side wall rising from a periphery of the bottom; a sealing plate having a top, and a second side wall extending from a periphery of the top and along inside the first side wall; and a gasket at least partially interposed between the first side wall and the second side wall, the sealing plate being made of common steel and being provided with: a first curved portion formed at a boundary between the top and the second side wall, a second curved portion formed continuously from the first curved portion, a third curved portion formed continuously from the second curved portion, and a descending portion formed continuously from the third curved portion, a ratio: R wherein the common steel is one of SS, SM and SPCC as defined by the Japanese Industrial Standard (JIS).