| 摘要 |
A sealed primary cell includes a metal receptacle (1), a metal cover (2) which closes the receptacle and a hard and resilient thermoplastic sealing ring (3) which may optionally be coated with a softer material (not shown). The sealing ring (3) is inserted between the cover (2) and the internal wall of the receptacle (1) and is radially compressed between the cover (2) and the receptacle (1). The invention is characterized in that the radial compression of the sealing ring (3) is achieved by radially outward deformation of the outer edge of the cover, e.g. by an auricular portion of a tool (7) enlarging a U-shaped peripheral rim of the cover. FIG. 2 shows the cell held in a die (9) after the sealing ring (3) has been radially compressed by the tool (7) but before the cell is finished by the usual inward crimping of the upper rim of the receptacle (1). |
