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| Study on the Hierarchical Active Equilibrium for Lithium-ion Batteries |
| Received:April 12, 2021 Revised:May 18, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.10.013 |
| KeyWord:lithium-ion batteries inconsistency active balancing balancing architecture |
| Author | Institution |
| NIE Wei-min |
State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai , China |
| CHEN Zi-qiang |
State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai , China |
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| Abstract: |
| Aiming at the inconsistency problem in series lithium-ion battery packs in actual equipment, a hierarchical active balancing architecture was proposed based on Buck-Boost circuit and flyback transformer equalization circuit. In this paper, the SOC was used as the equilibrium standard to formulate the equilibrium strategy. The second-order equivalent circuit model of the lithium-ion battery and the open circuit voltage (OCV) characteristic curve were established for parameter identification and SOC estimation. The energy transfer between adjacent battery cells in the battery pack and the energy transfer from any module to the whole battery pack were realized. Finally, the equilibrium model is built in Matlab/Simulink for simulation verification. The simulation results show that the hierarchical active balancing architecture has better balance results than traditional single adjacent battery balancing architecture. Its balancing effect has increased by 43.04%, balancing time has been shortened by 24.4%, and balancing efficiency has increased by 12.61%. The hierarchical active balancing architecture gave full play to the advantages of the two active balancing methods, improved the inconsistency of the battery pack and increased the charge and discharge capacity of the entire battery pack. |
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