In-plane compression porometry of battery separators

We have designed equipment that measures, by means of capillary flow porome try, the pore structure of sheet materials. The equipment measures the infl uence of superimposed compressive stress on pore structure as well. The bub ble point pressure, mean flow pressure, and flow distribution of a battery separator have been measured, and the influence of compressive stresses on these parameters have been observed. Our results demonstrate that the pore structure fur in-plane flow is considerably different from that for flow in the perpendicular direction, and the effect of superimposed compressive st ress is appreciable. (C) 1999 Elsevier Science S.A. All rights reserved.