The absorbent glass-mat (AGM) separator is a key determinant of the performance of the valve-regulated lead–acid battery (VRLA) through its influence on electrolyte supply, pore structure, resilience under compressive force, chemical purity, and consistency.
Hollingsworth and Vose are continuously developing new and improved methods of ex-situ testing to evaluate critical AGM properties to aid the battery designer in the selection of the proper separator for applications to insure good performance and long life.
Present AGM testing protocol has evolved from the methodology employed by the paper industry and does not completely encompass the complex demands placed on the AGM separator in modern battery designs.
Rapid battery stacking rates, high battery separator assembly pressures, aggressive acid filling, rapid battery formation, and the demanding duty of the batteries in application are not adequately addressed in accepted standard AGM testing protocol. New methodology is presented to characterize AGM compression and relaxation, stratification resistance, acid filling and ionic conductivity through the separator structure.

Nela Ren
Hollingsworth and Vose

Hollingsworth and Vose
Technology Manager

Biography: Nicolas Clement has seven years' experience in specialty papers in both USA and France within paper making company ArjoWiggins. He also has eight years' of experience in microglass fibre R&D for filtration and lead acid battery separator as R&D Manager at Bernard Dumas. Nicolas moved to the USA in 2009 for R&D responsibilities in filtration and AGM separator in Hollingsworth and Vose. He was responsible for all Asia pacific R&D for the same company between 2012 and 2013. Nicolas is now in charge of glass micro-fibre research in development, is West Groton Laboratory Manager and is still in charge of Asia pacific battery separator development.

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