Optimal battery thermal management for electric vehicles with battery degradation minimization

Yue Wu, Zhiwu Huang, Dongjun Li, Heng Li, Jun Peng, Daniel Stroe, Ziyou Song

Research output: Contribution to journalJournal articleResearchpeer-review

3 Citations (Scopus)
78 Downloads (Pure)

Abstract

The control of a battery thermal management system (BTMS) is essential for the thermal safety, energy efficiency, and durability of electric vehicles (EVs) in hot weather. To address the battery cooling optimization problem, this paper utilizes dynamic programming (DP) to develop an online rule-based control strategy. Firstly, an electrical–thermal-aging model of the LiFePO4 battery pack is established. A control-oriented onboard BTMS model is proposed and verified under different speed profiles and temperatures. Then in the DP framework, a cost function consisting of battery aging cost and cooling-induced electricity cost is minimized to obtain the optimal compressor power. By exacting three rules ”fast cooling, slow cooling, and temperature-maintaining” from the DP result, a near-optimal rule-based cooling strategy, which uses as much regenerative energy as possible to cool the battery pack, is proposed for online execution. Simulation results show that the proposed online strategy can dramatically improve the driving economy and reduce battery degradation under diverse operation conditions, achieving less than a 2.18% difference in battery loss compared to the offline DP. Recommendations regarding battery cooling under different real-world cases are finally provided.
Original languageEnglish
Article number122090
JournalApplied Energy
Volume353
Pages (from-to)122090
Number of pages13
ISSN0306-2619
DOIs
Publication statusPublished - 1 Jan 2024

Keywords

  • Battery Degradation
  • Battery Thermal Management System
  • Dynamic programming
  • Eco-cooling
  • Economy analysis
  • Electric Vehicles

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