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Comparison of cell encapsulation technologies for single pressure vessel nickel-hydrogen battery

Two single pressure vessel (SPV) batteries containing 22 series-connected nickel-hydrogen (Ni-H/sub 2/) cells of 19-Ah capacity were designed and procured from Eagle-Picher Industries. The two batteries were similar in mechanical design, dimensions, and composition of the active core. However, they differed in cell encapsulation, location and structure of the gas diffusion membrane, and cell activation. Both batteries have been subjected to detailed flight qualification testing at COMSAT Laboratories. The batteries met the requirements in capacity, capacity retention, discharge voltage, impedance, thermal behavior in vacuum, and response to vibration. The batteries are currently being cycle tested in a low earth orbit (LEG) regime using V-T charge control at a depth of discharge of 40 percent and at 20/spl deg/C. The battery design, and its characterization, environmental, and LEO cycle test data are presented herein.