Patent ID: 6660425
Filing Date: 2003-12-09
Classification: B01J,H01M,Y02E

Abstract:
A valve regulated lead acid (VRLA) battery cell comprising:a sealed housing; a positive electrode positioned in the housing; a negative electrode positioned in the housing in spaced relationship from the positive electrode; an electrolyte in said housing in contact with said positive and negative electrodes; a gas space within said housing in which oxygen and hydrogen gas collects; a pressure relief valve which allows gas to escape from the housing and which prevents oxygen gas from outside the housing from contacting said negative electrode; a catalyst device arranged to be in contact with at least a portion of said oxygen and hydrogen gas, said device including a container having a container wall and defining an internal chamber, and a catalyst arranged within said chamber, said catalyst capable of reacting oxygen gas and hydrogen gas to form water vapor; said catalyst being in gas communication with said gas space so as to allow gas from said gas space to contact said catalyst, and further being isolated from said oxygen gas from outside said housing; and a catalyst poison filter arranged to be in contact with at least a portion of said oxygen and hydrogen gas.