Fast charging optimization for lithium-ion batteries based on dynamic programming algorithm and electrochemical-thermal-capacity fade coupled model

Enabling fast charging of lithium-ion batteries may accelerate the commercial application of electric vehicles (EVs). The fast charging, however, could lead to capacity fade, lithium plating, and thermal runaway. This paper develops an optimal multi-stage charging protocol for lithium-ion batteries...

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Bibliographic Details
Published in:Journal of power sources Vol. 438; p. 227015
Main Authors: Xu, Meng, Wang, Rui, Zhao, Peng, Wang, Xia
Format: Journal Article
Language:English
Published: Elsevier B.V 31.10.2019
Subjects:
Cycle life
Dynamic programming
Electrochemical-thermal-capacity fade model
Fast charging optimization
Heat generation
Lithium ion batteries
Lithium ion batteries
Heat generation
Electrochemical-thermal-capacity fade model
Cycle life
Fast charging optimization
Dynamic programming
ISSN:0378-7753, 1873-2755
Online Access:Get full text
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Summary:Enabling fast charging of lithium-ion batteries may accelerate the commercial application of electric vehicles (EVs). The fast charging, however, could lead to capacity fade, lithium plating, and thermal runaway. This paper develops an optimal multi-stage charging protocol for lithium-ion batteries to minimize capacity fade due to the solid-electrolyte interphase (SEI) increase, to maximize the SEI potential to decrease the lithium plating, and to reduce the temperature rise to avoid a thermal runaway situation. An electrochemical-thermal-capacity fade coupled model is developed to monitor the battery internal state. The dynamic programming (DP) optimization algorithm is employed to search for the suboptimal charging current profiles. The optimization results illustrate that the optimized charging current profile varies with the state of charge (SOC) and the cycle number. As compared to the constant current charging protocol, each optimized charging strategy can reduce the capacity fade ratio by 4.6%, increase the SEI potential by 57%, and reduce the temperature rise by 16.3% for over 3300 charging-discharging cycles, respectively. •An electrochemical-thermal-capacity fade coupled battery model is developed.•A multi-stage fast charging protocol is proposed by dynamic programming with model.•Battery can be fast charged with low capacity fade.•Battery can be fast charged with a reasonable low temperature rise.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2019.227015