| 摘要 |
An electric cell with a plastic top closure as a circular disc that has a peripheral co-axial and concentric plastic border ring with a pre-stressed convoluted metal spring ring disposed within the plastic ring to establish permanent radially outward pressure against the plastic border ring, which is crimped over the metal ring by the crimped end of the container can. The spring convolution serves additionally as a rigid backing element for an additional pressure force on the plastic border ring, to prevent or limit unsealing effects that could arise from cold flow and creepage of the plastic ring. |
