Bipolar battery and a method for manufacturing a bipolar battery

A method to manufacture a bipolar battery having at least two cells, the method comprising:

• providing a housing,
• arranging a negative end terminal having a negative electrode within the housing,
• arranging 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, in a sandwich structure between said negative end terminal and a positive end terminal, having a positive electrode within said housing,
• arranging a separator between each negative and positive electrode forming a battery cell, said separator including an electrolyte,
• providing 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,
• interposing a non-conductive plastic polymer frame 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, and
• sealing said housing.