A graphical model for evaluating the status of series-connected lithium-ion battery pack

被引：32
作者：
Feng, Xuning [1 ,2 ]
Xu, Chengshan [2 ,3 ]
He, Xiangming [1 ]
Wang, Li [1 ]
Gao, Shang [2 ]
Ouyang, Minggao [2 ]
机构：
[1] Tsinghua Univ, Inst Nucl & New Energy Technol, Dept Automot Engn, Beijing 100084, Peoples R China
[2] Tsinghua Univ, State Key Lab Automot Safety & Energy, Dept Automot Engn, Beijing, Peoples R China
[3] China Agr Univ, Dept Mech Engn, Coll Engn, Beijing, Peoples R China
来源：
INTERNATIONAL JOURNAL OF ENERGY RESEARCH | 2019年 / 43卷 / 02期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
battery degradation; battery management; battery pack; cell variation; energy storage; graphical model; lithium-ion batteries; state estimation; CONTROLS-ORIENTED MODELS; CHARGE ESTIMATION; ELECTRIC VEHICLE; CELL VARIATIONS; ONLINE STATE; FRAMEWORK; PERFORMANCE; DIAGNOSIS; MODULES; MECHANISMS;
D O I：
10.1002/er.4305
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
State evaluation of battery pack is essential for battery management but laborious when dealing with massive information of cells within the pack. A graphical model for evaluating the status of series-connected Li-ion battery pack is established to release the burden. The model is founded by a 2D diagram, with the electric quantity "E" and the capacity "Q" as its axes, therefore called by the "E-Q diagram." The new graphical diagram presents the dynamics of cell variations in a linear way, thereby benefiting the design and management of battery pack, including (1) quantifying the cell variations by region, (2) illustrating the evolution of cell variations during aging, (3) guiding the estimation of pack states considering algorithm error in cell states, and (4) solving the balancing problem. The experimental results conform to the theoretical analysis, indicating that the E-Q diagram will be pervasively applied in the design and management of series-connected battery pack. Moreover, the E-Q diagram is suitable for education on the basics of a battery pack, because it is a graphical model.
引用
收藏
页码：749 / 766
页数：18
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