Duracell Inc.

Richard M Mank

David C Batson

Jane A Blasi

John D Sillesky

Rowland A Griffin

A sealed, prismatic electrochemical cell has an electrode plate comprising a porous structure with a maximum linear dimension of the porous structure in the principle direction of ion flow of at least 20 percent of the maximum linear dimension of the housing cavity in the principle direction of ion flow. The cell can produce good current density while having a high capacity. The electrode construction can result in a low diffusion polarization despite the thickness of the electrode. The overall cell can be economically manufactured, and has a low percentage of its internal volume occupied by inactive materials. Electrode plaque constructions and active material compounds are also disclosed.

Prismatic electrochemical cell

The invention features a prismatic battery with an electrically conductive housing comprising an elongated, prismatic can with an open end, and a housing cover pressed into the open end of the can and welded in place. The novel cover has an outer flange about its periphery, extending generally in the direction of extension of the sides of the can, which elastically deflects as the cover is pressed into the can to provide good contact for welding. The cover has two raised bumps forming internal pockets that are part of the internal volume of the cell. The bumps are also arranged to prevent rotation of the seal/vent assembly. One embodiment includes a plugged fill hole in one of the bumps. Corresponding methods of manufacture are also disclosed.

Prismatic battery housing

The invention relates to a non-aqueous electrochemical cell having spirally wound electrodes and a separator having a basis weight of at least 20 g/m.sup.2 and comprising melt blown non-woven polypropylene fibers.

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Weymouth, MA, United States of America

Richard M Mank