| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure where sealability by a gasket can be improved with a simple structure that can easily be manufactured in a flat battery where the gasket is injected and molded on an upper part of a peripheral wall of a sealing can.SOLUTION: A flat battery 1 includes: a positive electrode can 10 in a bottomed cylinder shape, which has a peripheral wall part 12 extending in a tube axis direction; a negative electrode can 20 in a bottomed cylinder shape, which has a peripheral wall part 22 extending in the tube axis direction; and a gasket 30 formed on the peripheral wall part 22 by injection and molding. The peripheral wall part 22 extends in the tube axis direction without a tip being folded. The gasket 30 includes: a coating part 31 molded on the peripheral wall part 22; and a projection 32 positioned outward in the tube axis direction to the peripheral wall part 22. In the projection 32, projection length in the tube axis direction is larger than length corresponding to a thickness direction of the peripheral wall part 22. |
