Abstract: The battery is charged and discharged according to the maximum discharge depth in traditional spacecraft battery reliability test. The failure model is used to support the overall reliability design of spacecraft, and cannot be used for the onorbit battery health assessment task. The sample rate, sampling precision and sample size of onorbit spacecraft telemetry are not comparable with those in civil field. The civil battery health assessment method based on high-speed sampling and large sample is not suitable for on-orbit battery health assessment. In order to solve this problem, based on the data characteristics of the on-orbit battery, the degradation features that can be extracted in the on-orbit state were excavated, and a multifeature comprehensive evaluation method was designed to realize the quantitative assessment of on-orbit battery health based on the fusion of degradation features including battery internal resistance, terminal voltage at the same depth of discharge and constant voltage charging time, which can be used as a reference for spacecraft health assessment technology.

Key words: discharge internal resistance, depth of discharge, constant voltage charging time, feature extraction, multi-feature fusion