Bipolar batteries based on Ebonex® technology

Continuing work by Atraverda on the production of a composite-laminate form of the Ebonex (R) material, that can be cheaply formulated and manufactured to form substrate plates for bipolar lead-acid batteries, is described. Ebonex (R) is the registered trade name of a range of titanium suboxide ceramic materials, typically Ti4O7 and Ti5O9, which combine electrical conductivity with high corrosion and oxidation resistance. Details of the structure of the composite, battery construction techniques and methods for filling and forming of batteries are discussed. In addition, lifetime and performance data obtained by Atraverda from laboratory bipolar lead-acid batteries and cells are presented. Battery production techniques for both conventional monopolar and bipolar batteries are reviewed. The findings indicate that substantial time and cost savings may be realised in the manufacture of bipolar batteries in comparison to conventional designs. This is due to the fewer processing steps required and more efficient formation. The results indicate that the use of Ebonex (R) composite material as a bipolar substrate will provide lightweight and durable highvoltage lead-acid batteries suitable for a wide range of applications including advanced automotive, stationary power and portable equipment. (c) 2004 Elsevier B.V. All rights reserved.