90-Ampere-Hour Nickel-Hydrogen Dependent Pressure Vessel (DPV) Low Earth Orbit (LEO) Life Test Evaluation

摘要

Three 90-Ah dependent pressure vessel (DPV) battery packs are being LEO life tested at Crane. As of 9/10/01, the 40% DoD pack has completed 4,863 total cycles, and the 60% DoD pack has completed 2,885 total cycles. The third pack, formerly tested at 71% DoD but currently run at 60% DOD, had 2,067 total cycles as of 9/24/01. The philosophy of these tests is to minimize charging to maximize life, so all the packs started with low charge-discharge (C/D) ratios. As a result, the charge conditions of the packs, especially the two 60% DoD packs, have been changed to find the appropriate operating points for these cells and packs.