During the on-orbit operation of satellites,accurate estimation of battery capacity is crucial for enhancing the safety and reliability of the power system.Given the difficulty in directly measuring the actual capacity of batter-ies during operation,a method for estimating battery capacity based on indirect health indicators is proposed in this paper.First,the average charging current is extracted from the current data of lithium batteries under the constant voltage charging mode,serving as a characteristic parameter reflecting the capacity degradation process.After suc-cessfully characterizing the health status of lithium batteries,a comparative analysis is conducted on the variation curves of capacity and average charging current with the charge and discharge cycles.Then,the correlation between capacity and average charging current is discussed.Based on this,a capacity estimation model is established.Final-ly,the availability and accuracy of the proposed approach are obtained through capacity estimation experiments by extracting the capacity and average charging current data from the NASA lithium-ion battery dataset and dividing them into training and test sets.
关键词
卫星锂电池/容量估计/间接健康因子/平均充电电流/相关性分析
Key words
satellite lithium batteries/capacity estimation/indirect health indicator/average charging current/cor-relation analysis
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