Technical-economic analysis for cascade utilization of spent power batteries in the energy storage system

Abstract

Cascade utilization cannot only make full use of the residual value of power batteries, but also weaken the threat of spent power batteries to the environment. In order to realize the green and sustainable development of the new energy automobile industry and promote the cascade utilization, the recycling system of spent power batteries, the characteristics of reverse logistics, and the relevant policies and standards of cascade utilization are summarized in this work. From the perspective of spent power battery recycling and cascade utilization of energy storage system, related technologies are discussed, including aging factors, detection, screening, regrouping, state estimation, capacity allocation, equilibrium strategies, etc. Combined with economy, the feasibility of large-scale application of cascade utilization is analyzed. In addition, this work also summarizes the typical mathematical formula of lithium battery aging diagnosis, residual capacity estimation and state estimation, which provides a reference for the construction of lithium battery fine model and digital twin model, and provides a theoretical basis for the design of lithium battery health management system. Finally, the problems and challenges faced by the cascade utilization of spent power batteries are discussed, as well as the future development prospects.