| 摘要 |
In a flat battery in which a gasket is sandwiched between a sealing can and an exterior can, sealing performance can be improved by the gasket while obtaining a structure capable of holding the sealing can by a mold when the gasket is molded to the sealing can. The flat battery (1) includes: a positive electrode can (10) and a negative electrode can (20); and a gasket (30) integrally formed on a peripheral wall portion (22) of the negative electrode can (20). The gasket (30) has a gasket end portion (33) having the function of sealing between the negative electrode can (20) and the positive electrode can (10) and a gasket outside portion (32) used for pushing the gasket end portion (33) to a bottom portion (11) of the positive electrode can (10) when the positive electrode can (10) is fitted into the negative electrode can (20). The gasket outside portion (32) is provided with a projecting portion (32a) at a position where the opening end of the peripheral wall portion (12) of the positive electrode can (10) is fitted. |
