Degradation-Aware Bi-Level Optimization of Second-Life Battery Energy Storage System Considering Demand Charge Reduction

Ali Hassan, Guilherme Vieira Hollweg, Wencong Su (), Xuan Zhou and Mengqi Wang
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Ali Hassan: Department of Electrical and Computer Engineering, University of Michigan, Dearborn, MI 48128, USA
Guilherme Vieira Hollweg: Department of Electrical and Computer Engineering, University of Michigan, Dearborn, MI 48128, USA
Wencong Su: Department of Electrical and Computer Engineering, University of Michigan, Dearborn, MI 48128, USA
Xuan Zhou: Department of Electrical and Computer Engineering, University of Michigan, Dearborn, MI 48128, USA
Mengqi Wang: Department of Electrical and Computer Engineering, University of Michigan, Dearborn, MI 48128, USA

Energies, 2025, vol. 18, issue 15, 1-15

Abstract: Many electric vehicle (EV) batteries will retire in the next 5–10 years around the globe. These batteries are retired when no longer suitable for energy-intensive EV operations despite having 70–80% capacity left. The second-life use of these battery packs has the potential to address the increasing demand for battery energy storage systems (BESSs) for the electric grid, which will also create a robust circular economy for EV batteries. This article proposes a two-layered energy management algorithm (monthly layer and daily layer) for demand charge reduction for an industrial consumer using photovoltaic (PV) panels and BESSs made of retired EV batteries. In the proposed algorithm, the monthly layer (ML) calculates the optimal dispatch for the whole month and feeds the output to the daily layer (DL), which optimizes the BESS dispatch, BESSs’ degradation, and energy imported/exported from/to the grid. The effectiveness of the proposed algorithm is tested as a case study of an industrial load using a real-world demand charge and Real-Time Pricing (RTP) tariff. Compared with energy management with no consideration of degradation or demand charge reduction, this algorithm results in 71% less degradation of BESS and 57.3% demand charge reduction for the industrial consumer.

Keywords: battery energy storage; second-life batteries; demand charge; circular economy; energy management (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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