Varta Batterie Aktiengesellschaft

Thomas Kuhl

Hans Sauer

The seal for the housing of a galvanic element, which has rotationally symmetrical housing portions is produced by a shrink fit provided through thermal expansion between the cup and the lid portions. This is produced by uniting with each other, in a crimping device, the housing cup using a heated die and upper ram, and a cooled housing lid which has been cooled by means of a cooled ejector.

Seal for galvanic element

A galvanic element, particularly of the button-cell type with hermetically sealed housing of plastic, uses electrode take-off conductors for each polarity positioned in labyrinthine shape inside the housing wall which is formed of two firmly connected layers. The ends of each labyrinthine take-off conductor respectively contact a connector terminal on the inside and a connector terminal on the outside of the housing wall. This provides an exceptionally long creepage path for the hydroxide electrolyte.

Tightly sealed galvanic element

A closure for a galvanic element, and particularly a cylindrical cell, is formed in substance of a cap-like or toroidal, resilient member, whose upstanding outer rim is segmented by slits into distinct flaps. These are therefore capable of acting resiliently in a radial direction and are capable of maintaining in the sealing region a steady sealing pressure between the cup and a plastic closure member. During closing of the cell through crimping, the flaps are supported from inside by a crimper support sleeve. In this way, the plastic of the closure body is plasticized during movement of the crimping tool toward the die.

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Eppstein, Germany

Thomas Kuhl