A Multi-dimensional Status Evaluation System of Battery Energy Storage for Efficient Operation and Maintenance Decision-Making

With the increasing application of the battery energy storage (BES), reasonable operating status evaluation can effectively support efficient operation and maintenance decisions, greatly improve safety, and extend the service life of the battery energy storage. This paper takes the lithium battery energy storage as the evaluation object. First, from the two dimensions of life characteristics and operational safety, the index system that can evaluate the operational status of a lithium-ion battery is studied. In order to establish an evaluation model based on the matter-element extension method, the combined weights of relevant evaluation indicators are obtained through the analytic hierarchy process (AHP) and the entropy weight method (EWM). The research results show that the operating status of the BES can be effectively evaluated by the proposed evaluation index system, providing a significant reference for finding battery faults and reasonably arranging battery maintenance or replacement.