Galvanic element
AssigneeVarta Batterie Aktiengesellschaft
InventorWerner Riedl
Life of this patent
Estimating the term…
Abstract
A galvanic element of buttom cell configuration is provided, in addition to the usual seal of thermoplastic material between cell terminal and cell cup, with an additional seal. This fills the annular gap which is created when a contact cap surrounding the galvanic element is attached to the cell terminal. The second seal is made, for example, by casting of bitumen or casting resin into the annular gap, shaking in of synthetic plastic powder and subsequent heat treatment for attachment, or by displacement of a heat sensitive glue from the contact cap in response to pressing into the cell. Also, pre-fabricated ceramic rings with metalized surfaces, which are soldered in place betweeen cell cup and contact cap, may be used as the second seal.
Claims8
Galvanic element including a positive electrode, a negative electrode, a separator, an electrolyte, and a housing which is closed in liquid-tight manner by a first seal which simultaneously provides electrical insulation between the cell terminals, said element comprising
- a contact cap which covers one terminal of the cell, the sealing region, and at least a portion of the second terminal of the cell, and
- an additional seal which is positioned at least between said covered portion of the second cell terminal and the contact cap.
Dependencies are inferred from the claim text.