Varta Batterie Aktiengesellschaft

Werner Riedl

Hans-Martin Lippold

Gerhard Schneider

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.

Galvanic element

An electrode for a primary cell is produced by first mixing a solid depolarizer, carbon, and a water-insoluble organic polymer binder. The mixture is then molded into an electrode body. The binder is in the mixture in the form of a dispersion in a hydrophilic medium.

Electrode and manufacturing method therefor

The cell cup of a primary element has a turned-over (crimped) rim engaging the underside of a synthetic plastic sealing member. The cell rim is turned over to between 140.degree. and 190.degree. and is engaged by the underside of the sealing member to the extent of 50 to 100.degree.. The end of the crimped rim abuts against a protrusion from the sealing member.

Growing community of inventors

Ellwangen, Germany

Werner Riedl