Patent ID: 7258949

Claim:
A bipolar battery having at least two battery cells comprising: a sealed housing, a negative end terminal having a negative electrode, a positive end terminal having a positive electrode, at least one biplate assembly having a negative electrode mounted on a negative side of a biplate and a positive electrode mounted on a positive side, being opposite to said negative side, of said biplate, arranged in a sandwich structure between said negative and said positive end terminals, a separator arranged between each negative and positive electrode forming a battery cell, said separator including an electrolyte, an inner barrier of a hydrophobic material arranged around at least one electrode on said biplate, whereby said inner barrier prevents an electrolyte path from one cell to another cell, and a non-conductive plastic polymer frame interposed between said biplate and said positive and said negative end terminals, said frame being attached to said biplate to permit gas to pass between said frame and said biplate, thereby creating a common gas space for all cells in the battery.